I know this game isn't very active but how come there isn't a coop glitchless or coop nmg category

mostly because (no offense) no one cares. or at least not enough people to make it a category. most think its more fun to play coop by absolutely cheesing it rather than just going vanilla playthrough but with a timer. but hey, maybe enough people would want to do that. i don't know. there arent even that many consistently running this game anyways.

The real answer is that in Portal 2 there isn't any clear distinction between what's a glitch and what's not. Is bhopping a glitch? If yes, how can you make the difference between bhopping and jumping repeatedly? Are you allowed to strafe? If not, does that mean you aren't allowed to touch A or D while in the air?

Both fair points, hadn't considered either of those.