I think I follow. I'm doing something sort of similar already, except my concern is that the combinations of the various flags I use will get out of hand pretty quickly, not to mention I've got some games that need to run on alternate emulators/cores and this method has no way to really take that into account. I guess what I'm wondering is if you think it'd be possible for me to set up some kind of form in my theme with a bunch of checkboxes for each flag, which the user can pull up in the game details screen before launching it, and toggle whichever combination they want which would then be passed into BBP and used to load the correct setup?