Using magic-trackpad for simple play/pause interface for movies or music

Backstory...my mother-in-law fell and has a spinal injury (C5), and she has no finger use, just her arms. I want to give her some control over her iPad to play or pause movies and music. Anyone have a script to assign the play/pause button as a single tap to the magic-trackpad?

Also, any other simple yet clever scripts for handicap use with the trackpad would be most appreciated.

Thanks, Don donroy (at) gmail.com