Covered here in more detail - http://forums.bistudio.com/showthread.php?148836-Suggestions-for-Streamlining-Fixing-Stance-Adjustment-amp-Movement-Speed-Controls/page3

LonoB - correct, so how does that help you go to the intermediate crouch?

Your solution does not address my request.
There are 2 stances in between prone and normal crouch.

I want to go from semi crouch to crouch and back again , with one key press and further more to assign the process to the mouse.

Also, you have to stop walking, then press ctrl and W to go up a stance then resume walking, the current stance cycle needs to be taken away from walk.

It would be nice to be able to change stance sequentially whilst jogging. Having the w key used for walking forward obscured this.

Also, instead of having to press 2 keys for stance;
We should be able to have a stance UP and DOWN keys mappable. We could then map this directly to a key and cycle through the stances in a linear fashion.
We should also be able to bind say, SHIFT + [ANY KEY] to stance up. Likewise for stance down.

Essentially untie the stance chang from thew walk keys.

As per Original Issue,[The default gamepad controls are unusable to due to dual mapping of turn/yaw right and fire.]

Please Fix I am having the same problem using a PS3 Pad and the DS3 Drivers, Emulating the Xbox for Windows Controller.