There is an interesting test for Multiple Sclerosis progression that uses the iPad in a very different way - attaching it to the back to assess walking and balance, clipping an apparatus to the screen to assess manual dexterity in a pegboard-like task, and a test very similar to coding, but done entirely on the iPad. Check here for a video summary and the full text of the article by Rudick, R. A., Miller, D., Bethoux, F., Rao, S. M., Lee, J. C., Stough, D., et al. The Multiple Sclerosis Performance Test (MSPT): An iPad-Based Disability Assessment Tool. J. Vis. Exp. (88), e51318, doi:10.3791/51318 (2014) for the full info.
Worth seeing to realize how much the iPad can actually do to facilitate testing.