FF VII, VIII & IX would take up too much space, you could end up with just those 3 games (if they can all fit) :wacko: No DS games afaik because the classic only has a shitty launch type controller.
If it can be hacked it will probably need extra external storage so you can have loads of games, NES/SNES games don't take up all much space but PSX is CD based.
Who knows if anything can be done about no DS controller :shrug: It's a serious system limitation.