Hi Mark!
Although I have very little background in any of that in terms of programming, I've also considered the use of video games in practice. Although I'm not far enough yet into studies to be able to make any specific statement on it, I have written a short (if not amateurish) paper regarding the potential of games for OT. You can e-mail me at
gvyrastorza@up.edu.ph if you're interested in reading it, although that's about all I can contribute to this topic (at this time; I may know more in the future). Cheers!
Ito