Dan, thanks for the suggestion. I strongly suspect PHAL is already doing this, since it works in all other Windows Mobile devices, including 320x240 Smartphone devices.
This image shows the effect, before running the full screen game and after, where an extra bar appears at the top and the email bar disappears:
The home screen changes appear to only go away with a phone reboot, which is far from being a nice thing.
Best Regards,
Jorge Diogo
http://Ludimate.com