First of all thank you for your effort.
I will definitely take a closer look at the algorithm. Unfortunately, my order of the REX is still pending and I have to wait a few weeks before I can start testing.
Are you aware of other promising algorithms for gaze tracking? As I mentioned elsewhere I am planning to use the tracker to control robots and therefor have to implement a robust tracking algorithm for moving objects in a 3D scenario.
During this project, I will definitively investigate options to enhance the precision of tracking in an ordinary desktop environment as well, as a side project. I hope we can achieve a level of accuracy that in the very most cases it is possible to control an ordinary application written for mouse and keyboard. I know you are working on a piece of software for a new experience and hope, this will be a big improvement over existing approaches.