http://www.veyboard.nl/en_main.html(stolen the idea if you hadn't guessed already...)
Here's something that ergonomic keyboard designers could borrow. If you rest your palms, you'll accidentally hit a key, but you might want to actually use that key later. A shift key could work well.
One step further would be to make it detachable, so it could be used as a footswitch if desired...
