Thanks for the info, Ralf!
And yes, having the option of letting VorpX ignore the tracker completely would be nice, because there are a lot of headtracking features in games already so VorpX just needs these tools to work.
This would be a very nice feature for every game out there with TrackIR support, because FaceTrackNoIR can read the Rift tracker data and feed it to the game without much setup hassle and VorpX delivers the visuals. Perfect combination.