Hi my friend, Just downloaded FaceTrackNoIR a few days ago. Thank you for creating and maintaining this useful and efficient tool. It was just a pleasure to provide a small donation and I would not mind to contribute more. Anyway - life would have been easier if the HELP/SUPPORT link had opened the Sourceforge Help pages. It didnt do that until until I had actually logged in to an SF account on the computer where I installed the FaceTrackNoIR package...and that was after spending a couple of hours...
Isn't it the "Peek around the headrest" option you are looking for. (To be found just below "Enable Revers Axis). This might be the one as you can define head X and Y position as well as angle for peek.