Add ability to cancel wall running

[t3r6]

I don't know if I'm missing something but to cancel wall running after pressing q you usually have to press a jump and it creates an additional impulse.
This is very inconvenient and not precise if you need to land on a specific platform in the middle of the wall run (this can be seen on some custom race maps).
Could you add an immediate wall running cancel by pressing the walk button or something when you are on the wall?
I mean it should be cancelled without an additional impulse. I guess the crouch button would not fit here since there are tricks connected with crouching during impulse but the walk button should be OK.
I'm not sure if it may break any game compatibility, though.