I’d like to suggest a change in the way core options per game work.
In the core options, you get the ability to save a per-game .opt file that can have different options from the main core.opt. However, unlike other overrides that only save the options that are different, it saves all the available options. That means, if you make a main core option change, it will not affect the games that you have saved a per-game opt. Instead you will have to open them all and edit them so they can all get the change.
Can the per game opt files only save the changed options, just like other overrides do?