shineh
only problem I could see with it is finding the balance between sensitivity and getting involved in the game - for example, in TF2, it's automatic for me to do a quick 180 degree spin every few seconds so I can check what's behind me. obviously, a bit annoying with this gun, and while you could effectively turn the sensitivity of the tracker up so less movement by you transalates into more movement on screen, it probably wouldn't draw you into the game as much.
that's my 2 cents anyhow.
make a button, to quickly look behind you.....