has been done before, and is in the public domain...
I'd be surprised if they can get that due to prior activity in this area. E.g. ' The effects of bias and x, y correlation in tapping errors can be systematically compensated for in real time, improving the tapping accuracy. This information can also be used to automatically adapt screen layout to walking speed, simplifying and spreading out the targets as the speed increases.'
In
A. Crossan, R. Murray-Smith, S. Brewster, J. Kelly, B. Musizza, Gait Phase Effects in Mobile Interaction, CHI 2005, Portland.
http://www.dcs.gla.ac.uk/~rod/publications/CroMurBreKelMus05.pdf
And lots of academics were discussing that sort of thing long before that publication...
Biting the hand that feeds IT
