I haven't tried this myself yet, but apparantly you can use your web cam with this software to do a mouse/headtracking sort of thing. Perhaps a poor man's version of TrackIR? If it works well, maybe Scawen could pop it in to LFS as an option if there isn't already a mouse-look type of thing there somewhere.
http://www.download.com/Track/ ... 10644879.html?tag=lst-0-5
http://www.download.com/Track/ ... 10644879.html?tag=lst-0-5