diff --git a/src/settings_internal.h b/src/settings_internal.h
index 177d00a324..e473b47334 100644
--- a/src/settings_internal.h
+++ b/src/settings_internal.h
@@ -164,6 +164,12 @@ struct IntSettingDesc : SettingDesc {
 	 * @param The new value for the setting.
 	 */
 	typedef void PostChangeCallback(int32_t value);
+	/**
+	 * A callback to set the correct default value, in case it can be measured in time
+	 * units or expressed as a percentage.
+	 * @param value The prospective new value for the setting.
+	 */
+	typedef void GetDefaultValueCallback(int32_t &value);
 
 	template <
 		typename Tdef,
@@ -178,11 +184,13 @@ struct IntSettingDesc : SettingDesc {
 	IntSettingDesc(const SaveLoad &save, SettingFlag flags, bool startup, Tdef def,
 			Tmin min, Tmax max, Tinterval interval, StringID str, StringID str_help, StringID str_val,
 			SettingCategory cat, PreChangeCheck pre_check, PostChangeCallback post_callback,
-			GetTitleCallback get_title_cb, GetHelpCallback get_help_cb, SetValueDParamsCallback set_value_dparams_cb) :
+			GetTitleCallback get_title_cb, GetHelpCallback get_help_cb, SetValueDParamsCallback set_value_dparams_cb,
+			GetDefaultValueCallback get_def_cb) :
 		SettingDesc(save, flags, startup),
 			str(str), str_help(str_help), str_val(str_val), cat(cat), pre_check(pre_check),
 			post_callback(post_callback),
-			get_title_cb(get_title_cb), get_help_cb(get_help_cb), set_value_dparams_cb(set_value_dparams_cb) {
+			get_title_cb(get_title_cb), get_help_cb(get_help_cb), set_value_dparams_cb(set_value_dparams_cb),
+			get_def_cb(get_def_cb) {
 		if constexpr (std::is_base_of_v<StrongTypedefBase, Tdef>) {
 			this->def = def.base();
 		} else {
@@ -221,6 +229,7 @@ struct IntSettingDesc : SettingDesc {
 	GetTitleCallback *get_title_cb;
 	GetHelpCallback *get_help_cb;
 	SetValueDParamsCallback *set_value_dparams_cb;
+	GetDefaultValueCallback *get_def_cb; ///< Callback to set the correct default value
 
 	StringID GetTitle() const;
 	StringID GetHelp() const;
@@ -254,9 +263,10 @@ struct BoolSettingDesc : IntSettingDesc {
 	BoolSettingDesc(const SaveLoad &save, SettingFlag flags, bool startup, bool def,
 			StringID str, StringID str_help, StringID str_val, SettingCategory cat,
 			PreChangeCheck pre_check, PostChangeCallback post_callback,
-			GetTitleCallback get_title_cb, GetHelpCallback get_help_cb, SetValueDParamsCallback set_value_dparams_cb) :
+			GetTitleCallback get_title_cb, GetHelpCallback get_help_cb, SetValueDParamsCallback set_value_dparams_cb,
+			GetDefaultValueCallback get_def_cb) :
 		IntSettingDesc(save, flags, startup, def ? 1 : 0, 0, 1, 0, str, str_help, str_val, cat,
-			pre_check, post_callback, get_title_cb, get_help_cb, set_value_dparams_cb) {}
+			pre_check, post_callback, get_title_cb, get_help_cb, set_value_dparams_cb, get_def_cb) {}
 
 	static std::optional<bool> ParseSingleValue(const char *str);
 
@@ -273,9 +283,9 @@ struct OneOfManySettingDesc : IntSettingDesc {
 			int32_t max, StringID str, StringID str_help, StringID str_val, SettingCategory cat,
 			PreChangeCheck pre_check, PostChangeCallback post_callback,
 			GetTitleCallback get_title_cb, GetHelpCallback get_help_cb, SetValueDParamsCallback set_value_dparams_cb,
-			std::initializer_list<const char *> many, OnConvert *many_cnvt) :
+			GetDefaultValueCallback get_def_cb, std::initializer_list<const char *> many, OnConvert *many_cnvt) :
 		IntSettingDesc(save, flags, startup, def, 0, max, 0, str, str_help, str_val, cat,
-			pre_check, post_callback, get_title_cb, get_help_cb, set_value_dparams_cb), many_cnvt(many_cnvt)
+			pre_check, post_callback, get_title_cb, get_help_cb, set_value_dparams_cb, get_def_cb), many_cnvt(many_cnvt)
 	{
 		for (auto one : many) this->many.push_back(one);
 	}
@@ -296,9 +306,9 @@ struct ManyOfManySettingDesc : OneOfManySettingDesc {
 		int32_t def, StringID str, StringID str_help, StringID str_val, SettingCategory cat,
 		PreChangeCheck pre_check, PostChangeCallback post_callback,
 		GetTitleCallback get_title_cb, GetHelpCallback get_help_cb, SetValueDParamsCallback set_value_dparams_cb,
-		std::initializer_list<const char *> many, OnConvert *many_cnvt) :
+		GetDefaultValueCallback get_def_cb, std::initializer_list<const char *> many, OnConvert *many_cnvt) :
 		OneOfManySettingDesc(save, flags, startup, def, (1 << many.size()) - 1, str, str_help,
-			str_val, cat, pre_check, post_callback, get_title_cb, get_help_cb, set_value_dparams_cb, many, many_cnvt) {}
+			str_val, cat, pre_check, post_callback, get_title_cb, get_help_cb, set_value_dparams_cb, get_def_cb, many, many_cnvt) {}
 
 	size_t ParseValue(const char *str) const override;
 	std::string FormatValue(const void *object) const override;
diff --git a/src/table/settings.h.preamble b/src/table/settings.h.preamble
index 51ce3e083a..464ccfe853 100644
--- a/src/table/settings.h.preamble
+++ b/src/table/settings.h.preamble
@@ -58,11 +58,11 @@ static StringID SettingHelpWallclock(const IntSettingDesc &sd);
 
 /* Macros for various objects to go in the configuration file.
  * This section is for global variables */
-#define SDTG_VAR(name, type, flags, var, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)\
-	NSD(Int, SLEG_GENERAL(name, SL_VAR, var, type, 1, from, to, extra), flags, startup, def, min, max, interval, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook)
+#define SDTG_VAR(name, type, flags, var, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)\
+	NSD(Int, SLEG_GENERAL(name, SL_VAR, var, type, 1, from, to, extra), flags, startup, def, min, max, interval, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook)
 
-#define SDTG_BOOL(name, flags, var, def, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)\
-	NSD(Bool, SLEG_GENERAL(name, SL_VAR, var, SLE_BOOL, 1, from, to, extra), flags, startup, def, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook)
+#define SDTG_BOOL(name, flags, var, def, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)\
+	NSD(Bool, SLEG_GENERAL(name, SL_VAR, var, SLE_BOOL, 1, from, to, extra), flags, startup, def, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook)
 
 #define SDTG_LIST(name, type, flags, var, def, length, from, to, cat, extra, startup)\
 	NSD(List, SLEG_GENERAL(name, SL_ARR, var, type, length, from, to, extra),flags, startup, def)
@@ -70,22 +70,22 @@ static StringID SettingHelpWallclock(const IntSettingDesc &sd);
 #define SDTG_SSTR(name, type, flags, var, def, max_length, pre_check, post_callback, from, to, cat, extra, startup)\
 	NSD(String, SLEG_GENERAL(name, SL_STDSTR, var, type, sizeof(var), from, to, extra), flags, startup, def, max_length, pre_check, post_callback)
 
-#define SDTG_OMANY(name, type, flags, var, def, max, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)\
-	NSD(OneOfMany, SLEG_GENERAL(name, SL_VAR, var, type, 1, from, to, extra), flags, startup, def, max, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, full, nullptr)
+#define SDTG_OMANY(name, type, flags, var, def, max, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)\
+	NSD(OneOfMany, SLEG_GENERAL(name, SL_VAR, var, type, 1, from, to, extra), flags, startup, def, max, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, full, nullptr)
 
-#define SDTG_MMANY(name, type, flags, var, def, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)\
-	NSD(ManyOfMany, SLEG_GENERAL(name, SL_VAR, var, type, 1, from, to, extra), flags, startup, def, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, full, nullptr)
+#define SDTG_MMANY(name, type, flags, var, def, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)\
+	NSD(ManyOfMany, SLEG_GENERAL(name, SL_VAR, var, type, 1, from, to, extra), flags, startup, def, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, full, nullptr)
 
 /* Macros for various objects to go in the configuration file.
  * This section is for structures where their various members are saved */
-#define SDT_VAR(base, var, type, flags, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)\
-	NSD(Int, SLE_GENERAL(SL_VAR, base, var, type, 1, from, to, extra), flags, startup, def, min, max, interval, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook)
+#define SDT_VAR(base, var, type, flags, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)\
+	NSD(Int, SLE_GENERAL(SL_VAR, base, var, type, 1, from, to, extra), flags, startup, def, min, max, interval, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook)
 
-#define SDT_VAR_NAME(base, var, type, flags, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup, name)\
-	NSD(Int, SLE_GENERAL_NAME(SL_VAR, name, base, var, type, 1, from, to, extra), flags, startup, def, min, max, interval, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook)
+#define SDT_VAR_NAME(base, var, type, flags, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup, name)\
+	NSD(Int, SLE_GENERAL_NAME(SL_VAR, name, base, var, type, 1, from, to, extra), flags, startup, def, min, max, interval, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook)
 
-#define SDT_BOOL(base, var, flags, def, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)\
-	NSD(Bool, SLE_GENERAL(SL_VAR, base, var, SLE_BOOL, 1, from, to, extra), flags, startup, def, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook)
+#define SDT_BOOL(base, var, flags, def, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)\
+	NSD(Bool, SLE_GENERAL(SL_VAR, base, var, SLE_BOOL, 1, from, to, extra), flags, startup, def, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook)
 
 #define SDT_LIST(base, var, type, flags, def, from, to, cat, extra, startup)\
 	NSD(List, SLE_GENERAL(SL_ARR, base, var, type, lengthof(((base*)8)->var), from, to, extra), flags, startup, def)
@@ -93,18 +93,18 @@ static StringID SettingHelpWallclock(const IntSettingDesc &sd);
 #define SDT_SSTR(base, var, type, flags, def, pre_check, post_callback, from, to, cat, extra, startup)\
 	NSD(String, SLE_GENERAL(SL_STDSTR, base, var, type, sizeof(((base*)8)->var), from, to, extra), flags, startup, def, 0, pre_check, post_callback)
 
-#define SDT_OMANY(base, var, type, flags, def, max, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, load, cat, extra, startup)\
-	NSD(OneOfMany, SLE_GENERAL(SL_VAR, base, var, type, 1, from, to, extra), flags, startup, def, max, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, full, load)
+#define SDT_OMANY(base, var, type, flags, def, max, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, load, cat, extra, startup)\
+	NSD(OneOfMany, SLE_GENERAL(SL_VAR, base, var, type, 1, from, to, extra), flags, startup, def, max, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, full, load)
 
-#define SDT_MMANY(base, var, type, flags, def, full, str, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, strhelp, strval, from, to, cat, extra, startup)\
-	NSD(ManyOfMany, SLE_GENERAL(SL_VAR, base, var, type, 1, from, to, extra), flags, startup, def, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, full, nullptr)
+#define SDT_MMANY(base, var, type, flags, def, full, str, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, strhelp, strval, from, to, cat, extra, startup)\
+	NSD(ManyOfMany, SLE_GENERAL(SL_VAR, base, var, type, 1, from, to, extra), flags, startup, def, str, strhelp, strval, cat, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, full, nullptr)
 
 
-#define SDTC_VAR(var, type, flags, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)\
-	SDTG_VAR(#var, type, flags, _settings_client.var, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)
+#define SDTC_VAR(var, type, flags, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)\
+	SDTG_VAR(#var, type, flags, _settings_client.var, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)
 
-#define SDTC_BOOL(var, flags, def, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)\
-	SDTG_BOOL(#var, flags, _settings_client.var, def, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)
+#define SDTC_BOOL(var, flags, def, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)\
+	SDTG_BOOL(#var, flags, _settings_client.var, def, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)
 
 #define SDTC_LIST(var, type, flags, def, from, to, cat, extra, startup)\
 	SDTG_LIST(#var, type, flags, _settings_client.var, def, lengthof(_settings_client.var), from, to, cat, extra, startup)
@@ -112,5 +112,5 @@ static StringID SettingHelpWallclock(const IntSettingDesc &sd);
 #define SDTC_SSTR(var, type, flags, def, max_length, pre_check, post_callback, from, to, cat, extra, startup)\
 	SDTG_SSTR(#var, type, flags, _settings_client.var, def, max_length, pre_check, post_callback, from, to, cat, extra, startup)\
 
-#define SDTC_OMANY(var, type, flags, def, max, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)\
-	SDTG_OMANY(#var, type, flags, _settings_client.var, def, max, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, from, to, cat, extra, startup)
+#define SDTC_OMANY(var, type, flags, def, max, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)\
+	SDTG_OMANY(#var, type, flags, _settings_client.var, def, max, full, str, strhelp, strval, pre_check, post_callback, get_title_hook, get_help_hook, set_value_dparams_hook, get_def_hook, from, to, cat, extra, startup)
diff --git a/src/table/settings/company_settings.ini b/src/table/settings/company_settings.ini
index 9c3b7a64ba..ad7a026887 100644
--- a/src/table/settings/company_settings.ini
+++ b/src/table/settings/company_settings.ini
@@ -17,8 +17,8 @@ static const SettingVariant _company_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDT_BOOL = SDT_BOOL(CompanySettings, $var,        $flags, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
-SDT_VAR  =  SDT_VAR(CompanySettings, $var, $type, $flags, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
+SDT_BOOL = SDT_BOOL(CompanySettings, $var,        $flags, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
+SDT_VAR  =  SDT_VAR(CompanySettings, $var, $type, $flags, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
 
 [validation]
 SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for CompanySettings.$var exceeds storage size");
@@ -34,6 +34,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/currency_settings.ini b/src/table/settings/currency_settings.ini
index 84cc209bdb..2bc3c2328a 100644
--- a/src/table/settings/currency_settings.ini
+++ b/src/table/settings/currency_settings.ini
@@ -11,7 +11,7 @@ static const SettingVariant _currency_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDT_VAR  = SDT_VAR (CurrencySpec, $var, $type, $flags, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
+SDT_VAR  = SDT_VAR (CurrencySpec, $var, $type, $flags, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
 SDT_SSTR = SDT_SSTR(CurrencySpec, $var, $type, $flags, $def,                                                 $pre_cb, $post_cb, $from, $to, $cat, $extra, $startup),
 
 [validation]
@@ -28,6 +28,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/difficulty_settings.ini b/src/table/settings/difficulty_settings.ini
index 9503f99399..4e8e1044a9 100644
--- a/src/table/settings/difficulty_settings.ini
+++ b/src/table/settings/difficulty_settings.ini
@@ -20,9 +20,9 @@ static const SettingVariant _difficulty_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDTG_VAR   =   SDTG_VAR($name,              $type, $flags, $var, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDTG_VAR   =   SDTG_VAR($name,              $type, $flags, $var, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_VAR    =   SDT_VAR (GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDTG_VAR = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -39,6 +39,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/economy_settings.ini b/src/table/settings/economy_settings.ini
index eb920b7ceb..02a4e70de7 100644
--- a/src/table/settings/economy_settings.ini
+++ b/src/table/settings/economy_settings.ini
@@ -16,8 +16,8 @@ static const SettingVariant _economy_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_VAR    =   SDT_VAR (GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for GameSettings.$var exceeds storage size");
@@ -33,6 +33,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/game_settings.ini b/src/table/settings/game_settings.ini
index d77103d9d2..07adda5cc9 100644
--- a/src/table/settings/game_settings.ini
+++ b/src/table/settings/game_settings.ini
@@ -26,12 +26,12 @@ static const SettingVariant _game_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDTG_BOOL  =  SDTG_BOOL($name,                     $flags, $var, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDTG_VAR   =   SDTG_VAR($name,              $type, $flags, $var, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_OMANY  =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $load, $cat, $extra, $startup),
-SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDTG_BOOL  =  SDTG_BOOL($name,                     $flags, $var, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDTG_VAR   =   SDTG_VAR($name,              $type, $flags, $var, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_OMANY  =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $load, $cat, $extra, $startup),
+SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDTG_VAR = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -49,6 +49,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/gui_settings.ini b/src/table/settings/gui_settings.ini
index 9adeed0029..903a9532a1 100644
--- a/src/table/settings/gui_settings.ini
+++ b/src/table/settings/gui_settings.ini
@@ -25,9 +25,9 @@ static const SettingVariant _gui_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDTC_OMANY = SDTC_OMANY(              $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDTC_VAR   =   SDTC_VAR(              $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_OMANY = SDTC_OMANY(              $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_VAR   =   SDTC_VAR(              $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDTC_OMANY = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -44,6 +44,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/linkgraph_settings.ini b/src/table/settings/linkgraph_settings.ini
index 1144401912..0d19e7dba6 100644
--- a/src/table/settings/linkgraph_settings.ini
+++ b/src/table/settings/linkgraph_settings.ini
@@ -12,7 +12,7 @@ static const SettingVariant _linkgraph_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for GameSettings.$var exceeds storage size");
@@ -28,6 +28,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/locale_settings.ini b/src/table/settings/locale_settings.ini
index 7d23f4c7ae..efd1fb98c6 100644
--- a/src/table/settings/locale_settings.ini
+++ b/src/table/settings/locale_settings.ini
@@ -21,8 +21,8 @@ static const SettingVariant _locale_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDTG_OMANY = SDTG_OMANY($name,              $type, $flags, $var, $def,       $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_OMANY  =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $load, $cat, $extra, $startup),
+SDTG_OMANY = SDTG_OMANY($name,              $type, $flags, $var, $def,       $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_OMANY  =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $load, $cat, $extra, $startup),
 SDT_SSTR   =   SDT_SSTR(GameSettings, $var, $type, $flags, $def,                                                       $pre_cb, $post_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
@@ -40,6 +40,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/misc_settings.ini b/src/table/settings/misc_settings.ini
index 49141ed014..0da92b33bd 100644
--- a/src/table/settings/misc_settings.ini
+++ b/src/table/settings/misc_settings.ini
@@ -25,11 +25,11 @@ static const SettingVariant _misc_settings_table[] = {
 };
 [templates]
 SDTG_LIST  =  SDTG_LIST($name, $type, $flags, $var, $def,       $length,                                                            $from, $to, $cat, $extra, $startup),
-SDTG_MMANY = SDTG_MMANY($name, $type, $flags, $var, $def,                        $full, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
-SDTG_OMANY = SDTG_OMANY($name, $type, $flags, $var, $def,       $max,            $full, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
+SDTG_MMANY = SDTG_MMANY($name, $type, $flags, $var, $def,                        $full, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
+SDTG_OMANY = SDTG_OMANY($name, $type, $flags, $var, $def,       $max,            $full, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
 SDTG_SSTR  =  SDTG_SSTR($name, $type, $flags, $var, $def,       0,                                               $pre_cb, $post_cb, $from, $to, $cat, $extra, $startup),
-SDTG_BOOL  =  SDTG_BOOL($name,        $flags, $var, $def,                               $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
-SDTG_VAR   =   SDTG_VAR($name, $type, $flags, $var, $def, $min, $max, $interval,        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
+SDTG_BOOL  =  SDTG_BOOL($name,        $flags, $var, $def,                               $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
+SDTG_VAR   =   SDTG_VAR($name, $type, $flags, $var, $def, $min, $max, $interval,        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
 
 [validation]
 SDTG_VAR = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -46,6 +46,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/multimedia_settings.ini b/src/table/settings/multimedia_settings.ini
index 17579991c4..8d766a62d6 100644
--- a/src/table/settings/multimedia_settings.ini
+++ b/src/table/settings/multimedia_settings.ini
@@ -12,9 +12,9 @@ static const SettingVariant _multimedia_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 SDTC_LIST  =  SDTC_LIST(              $var, $type, $flags, $def,                                                                          $from, $to,        $cat, $extra, $startup),
-SDTC_VAR   =   SDTC_VAR(              $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_VAR   =   SDTC_VAR(              $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDTC_VAR = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -30,6 +30,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/network_private_settings.ini b/src/table/settings/network_private_settings.ini
index 967dfb2054..6888cbe90e 100644
--- a/src/table/settings/network_private_settings.ini
+++ b/src/table/settings/network_private_settings.ini
@@ -14,8 +14,8 @@ static const SettingVariant _network_private_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDTC_OMANY = SDTC_OMANY(              $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_OMANY = SDTC_OMANY(              $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 SDTC_SSTR  =  SDTC_SSTR(              $var, $type, $flags, $def,             $length,                                  $pre_cb, $post_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
@@ -32,6 +32,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/network_settings.ini b/src/table/settings/network_settings.ini
index a96c2c9a5c..52a02853bb 100644
--- a/src/table/settings/network_settings.ini
+++ b/src/table/settings/network_settings.ini
@@ -16,9 +16,9 @@ static const SettingVariant _network_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDTC_OMANY = SDTC_OMANY(              $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDTC_VAR   =   SDTC_VAR(              $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_BOOL  =  SDTC_BOOL(              $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_OMANY = SDTC_OMANY(              $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_VAR   =   SDTC_VAR(              $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDTC_OMANY = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -35,6 +35,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/news_display_settings.ini b/src/table/settings/news_display_settings.ini
index 41419227c1..fe18cad6c7 100644
--- a/src/table/settings/news_display_settings.ini
+++ b/src/table/settings/news_display_settings.ini
@@ -13,7 +13,7 @@ static const SettingVariant _news_display_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDTC_OMANY = SDTC_OMANY(              $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDTC_OMANY = SDTC_OMANY(              $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDTC_OMANY = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -29,6 +29,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/old_gameopt_settings.ini b/src/table/settings/old_gameopt_settings.ini
index 661534d136..4daf62a57c 100644
--- a/src/table/settings/old_gameopt_settings.ini
+++ b/src/table/settings/old_gameopt_settings.ini
@@ -31,12 +31,12 @@ static const SettingVariant _old_gameopt_settings_table[] = {
 };
 [templates]
 SDTG_LIST    =  SDTG_LIST($name,              $type, $flags, $var, $def, $length, $from, $to, $cat, $extra, $startup),
-SDTG_VAR     =   SDTG_VAR($name,              $type, $flags, $var, $def, $min, $max, $interval,  $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
-SDT_NULL     =   SDT_NULL(                                                          $length,                                                            $from, $to),
-SDTC_OMANY   = SDTC_OMANY(              $var, $type, $flags, $def,       $max, $full,            $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDTG_OMANY   = SDTG_OMANY($name,              $type, $flags, $var, $def, $max, $full,            $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_OMANY    =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,       $max, $full,            $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $load, $cat, $extra, $startup),
-SDT_VAR      =    SDT_VAR(GameSettings, $var, $type, $flags, $def, $min, $max,        $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDTG_VAR     =   SDTG_VAR($name,              $type, $flags, $var, $def, $min, $max, $interval,  $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
+SDT_NULL     =   SDT_NULL(                                                          $length,                                                                                      $from, $to),
+SDTC_OMANY   = SDTC_OMANY(              $var, $type, $flags, $def,       $max, $full,            $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDTG_OMANY   = SDTG_OMANY($name,              $type, $flags, $var, $def, $max, $full,            $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_OMANY    =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,       $max, $full,            $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $load, $cat, $extra, $startup),
+SDT_VAR      =    SDT_VAR(GameSettings, $var, $type, $flags, $def, $min, $max,        $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDTG_VAR = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -56,6 +56,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/pathfinding_settings.ini b/src/table/settings/pathfinding_settings.ini
index 105fdc263f..75ec95e7a6 100644
--- a/src/table/settings/pathfinding_settings.ini
+++ b/src/table/settings/pathfinding_settings.ini
@@ -14,8 +14,8 @@ static const SettingVariant _pathfinding_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for GameSettings.$var exceeds storage size");
@@ -31,6 +31,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/script_settings.ini b/src/table/settings/script_settings.ini
index ab85cfaff0..9affe3e61b 100644
--- a/src/table/settings/script_settings.ini
+++ b/src/table/settings/script_settings.ini
@@ -13,9 +13,9 @@ static const SettingVariant _script_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_OMANY  =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $load, $cat, $extra, $startup),
-SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_OMANY  =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $load, $cat, $extra, $startup),
+SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDT_OMANY = static_assert($max <= MAX_$type, "Maximum value for GameSettings.$var exceeds storage size");
@@ -32,6 +32,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/win32_settings.ini b/src/table/settings/win32_settings.ini
index f5c8d6813b..d54f10e109 100644
--- a/src/table/settings/win32_settings.ini
+++ b/src/table/settings/win32_settings.ini
@@ -17,8 +17,8 @@ static const SettingVariant _win32_settings_table[] = {
 };
 #endif /* _WIN32 */
 [templates]
-SDTG_BOOL = SDTG_BOOL($name,        $flags, $var, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
-SDTG_VAR  =  SDTG_VAR($name, $type, $flags, $var, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
+SDTG_BOOL = SDTG_BOOL($name,        $flags, $var, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
+SDTG_VAR  =  SDTG_VAR($name, $type, $flags, $var, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
 
 [validation]
 SDTG_VAR = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -34,6 +34,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/window_settings.ini b/src/table/settings/window_settings.ini
index 7a38c46eab..4984abe200 100644
--- a/src/table/settings/window_settings.ini
+++ b/src/table/settings/window_settings.ini
@@ -13,8 +13,8 @@ static const SettingVariant _window_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDT_BOOL = SDT_BOOL(WindowDesc, $var,        $flags, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
-SDT_VAR  =  SDT_VAR(WindowDesc, $var, $type, $flags, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $cat, $extra, $startup),
+SDT_BOOL = SDT_BOOL(WindowDesc, $var,        $flags, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
+SDT_VAR  =  SDT_VAR(WindowDesc, $var, $type, $flags, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $cat, $extra, $startup),
 
 [validation]
 SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for WindowDesc.$var exceeds storage size");
@@ -30,6 +30,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION
diff --git a/src/table/settings/world_settings.ini b/src/table/settings/world_settings.ini
index 68225dbc26..6b5d1466e0 100644
--- a/src/table/settings/world_settings.ini
+++ b/src/table/settings/world_settings.ini
@@ -18,9 +18,9 @@ static const SettingVariant _world_settings_table[] = {
 [post-amble]
 };
 [templates]
-SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
-SDT_OMANY  =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to, $load, $cat, $extra, $startup),
-SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $from, $to,        $cat, $extra, $startup),
+SDT_BOOL   =   SDT_BOOL(GameSettings, $var,        $flags, $def,                              $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
+SDT_OMANY  =  SDT_OMANY(GameSettings, $var, $type, $flags, $def,             $max, $full,     $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to, $load, $cat, $extra, $startup),
+SDT_VAR    =    SDT_VAR(GameSettings, $var, $type, $flags, $def,       $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $str_cb, $help_cb, $val_cb, $def_cb, $from, $to,        $cat, $extra, $startup),
 
 [validation]
 SDT_OMANY = static_assert($max <= MAX_$type, "Maximum value for GameSettings.$var exceeds storage size");
@@ -37,6 +37,7 @@ post_cb  = nullptr
 str_cb   = nullptr
 help_cb  = nullptr
 val_cb   = nullptr
+def_cb   = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
 to       = SL_MAX_VERSION