OK, so I made a little progress on this. The path for the AI reactions (because apparently you only get one set for both object and edge reactions) is at ROOT\GameEngineData\Routines\Basic\System\AIReactions. I still have not found a way to change which scripts are included through the editor (meaning its not in script settings and various other spots I checked), but if you really need to change which scripts are used, you can change the file at ROOT\GameEngineData\Routines\Basic\BankData\Bank14.asm. If you scroll all the way down to the bottom there is a list of which scripts are included, that you can edit manually through code (but that really sucks).