I’ve had some pretty fantastic success pairing the eye cursor and an xbox controller as hybrid pointing devices. My current setup (which I’m now using at work, and at home for gaming) is the Rex, with a fast damped filter and a 30 pixel dead zone moving my mouse cursor, and the xbox controller for fine adjustments once my gaze has moved the cursor close to my target. I’m not using my homebrewed foot-pedal mouse buttons yet, but that’s only because I ran out of USB ports : D
I rarely have to adjust the cursor more than an inch on-screen with the gamepad, and with this hybrid setup, my eyestrain is gone. Total programming time to add these features to the MinimalGazeDataStream sample was maybe a few hours. Short example of my playing Peggle here: http://youtu.be/ErgHfJABRGk