Campaign
- It would be nice if the game tracked the fastest completion time of each level - even in each difficulty level. This would be nice addition if the in-game timer worked properly (It currently doesn't seem to work). The campaign is fun to try to speed run (Even with few mistakes like instant-kill script), and it would be neat if the game tracked the fastest completion times. The feature could also increase life span of the campaign. For example I have replayed the whole Story mode of TimeSplitters Future Perfect ridicolous amount of times just to try to break my old records.

Multiplayer
- I don't know if this is possible to create but it's related to the air stomp. It would be nice to be able to survive an air stomp by power jumping out of it. Currently the way the air stomp can kill enemies who are three/four meters in air feels odd.

What does everyone think about the air stomp suggestion?

Maybe they could introduce mutations like in Halo, those were always fun or quite even the opposite

Even though I have played Halo a lot, I don't know what you mean with mutations.

Edit: Oh, now I get what you meant. That would be great!

I'd like mutators like in Unreal/UT haha, imagine Fat Boy, or InstaGib with hip-fire Gauss Rifles/Bolt Snipers, that would be fun