you should add roll (when crouching double tap lean + direction, single tap when prone) just to make it easier to get infront of a door to surprise the guy behind it.

Rolling would be pretty sweet, also from prone rolling would be a great alternative to the really slow strafing.

the prone roll is available in americas army, but you cant
prone-roll-shoot-runaway

lol i remember in aa you could roll it just looked so stupid, but was very useful in bridgecrossing where you were snipin and some dude spotted you
btw wouldnt that mean a bit of annoying programming?

Or diving, aa had that too, it was fun