I can't count the hundreds of times I'v happen to enter amour mode, take out a few badies AND while still in armor mode slide. It happens to only make me crouch -_- Giving the enemy a prime opportunity to either get a nice little head shot or melee getting me killed 80% of the time.
Hopefully Crytec will happen to read this post and add armor slide for Crysis 3 ^_^
Or you can hire me :p And me will fix (somehow...)