So is it possible to rebind "Tab"?

[Nomz]

I noticed if you hold the "Tab" button down it speeds up your game to what I'm assuming the fastest your hardware can process it.

I was wondering if I could bind this to my controller? If not another key?

I'm using a normal, wired, 360 controller. I have every button bound except my left bumper, and I was hoping to use this for the speed up.