Plz Halp. Unable to Take Cover

[artao5]

I am unable to use the "take cover" mechanism. I have pretty much totally customized my keyboard layout to move it to my preferred ESDF cofig. I have Crouch (hold) on "c" and Crouch (toggle) on Left Alt. Holding either of them while near cover does nothing.
Any ideas? There's no options to assign that in the game menu.

 

[cartlidge]

go to a corner and aim with your gun,.. that's all I do for cover, as soon as I aim I peep round the cover some, it doesn't lock you into cover like some games

all I have done with this vid, is to crouch and go up to the wall and then aim, everything else is done automatically.