When you edit your profiles guys, there is a tab there for hotkeys - pause, precision and center I think (at work, so cant check). Make sure you have keys sorted for these, if you get too much body english, its quick and easy to recenter yourself. TrackIr (imo) is fantastic, and I wouldn't play without it now. Occassionally mine will freak out (which is normally when the sun comes up) and the IR goes haywire.
Hope this helps,
Wurzel