Climbing would make the game more challenging because you can get to many more places and in some ways is better than jump( you dont have to worry about bunnies). rolling would also be a big help when youre prone. If youre prone you could doubletap left or right and roll around a corner. It ywould also make moving in prone mode a little easier. And by the way people in prone mode are way too hard to hit. I shot a guy in prone with a sniper rifle and he wasnt even hurt.