Perhaps each setting has a "default scope", one of "global", "server", "save", "player"? I like the idea of a scope=<scope> property in the settings config, but not sure that should be an end-user choice (I can see where it would be useful, but do w...

It's mainly to restrict the input range in the GUI. So you don't need to on the mod side wonder if the player put "-5" for something like a search area setting. You can know for sure it's some non-negative value. Would be handy to have a 'signal' type that specifies any valid circuit sign...