That's a great idea! We're currently beta testing head tracking on the MouthPad^, which is aimed at improving upon traditional head tracking methods. This feature lets users recenter the tracker by simply placing their tongue on the trackpad, making navigation more intuitive and less fatiguing by reducing neck movements.
We're excited about the potential of the MouthPad^ to help people with various motor abilities. Its broad range of functionalities could be particularly helpful for individuals with conditions like Parkinson's.
Haven't looked in to your product at all, but am trying to help an eighty year old genius succumbing to Parkinsonism.