Toggle Alternative input

[cmstache]

Is there any setting or binding I can set (I do have admin rights) in order for me to change my input device on the fly without having to manually do it through the setup window?

For example, I want to set a hot key that will allow me to either toggle between input A and B or hold it down to temporarily switch from A to B as long as it's depressed. Is there any function for this? I could probably manage to use a separate Ventrilo window and just have one with PTT active and one not, but that seems a bit excessive to me.