Space-bar is nice for climbing over things. It could also be used for evasive maneuvers. Space and left and right make him dive and roll left and right if standing. Space and forward makes him dive into prone position. (in hardcore mode he looses health for diving on his face.)
If crouched, it makes you roll left and right. He remains in the crouch position when the roll is over. Maybe with a small cook-down timer so he can only roll after he recovers his balance. This will keep people from rolling around the map.
If prone, space makes him put his head down, so he is less of a target.
If near a car,box,or small wall , space + forward makes him dive over cars and crates and small walls like in "Saints row the third".
I just think it would be fun. You are crouched behind the corner of a building, you can roll our of cover, and into action, surprising the enemy. Or you can roll from one cover to the next, if it is close enough.
Maybe have this feature disabled when you are on the rooftops, to keep people from diving down 2 stories, and landing on their face. Either disabled, or if you dive off the roof you break your neck. (with disturbing stick breaking sound effect, and a grotesque rag-doll, with only a limp neck.
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