I love this idea.
Have you seen ThumbType (
[Link: osw.co.jp])? It overlays the graffiti area with a physical keyboard. It can be ripped off and put back on.
Imagine ThumbType but with transport buttons and maybe a few others. There's enough room for quite a few buttons in the graffiti area.
Only trouble is that you couldn't use graffiti when the overlay was on. Of course, you'd also need a modified OmniRemote. Still, it's fun to think of the possibilities.
Peter Sharpe
www.ordesktop.com