Another way to go about this. Simply bifurcate the head tracking interface functionality out of the stock game. Make it mouse only. Then offer two separate add-on packages. One for TrackIR users with their encrypted/proprietary interface and the other for Freetrack users with their free-use interface. The game is priced at ~$50 right now. So, say drop the price to $48 and price each headtracking add-on at say $2 dollars each as an example. This will maximize sales of the game and give the user more flexibility in how they want to play the game.
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