Press and hold keys to get alternate
 

How can I tweak the PPC 6800 (Sprint) so that when a key is pressed and held, it changes to the alternate? i.e. x turns to %, etc. I believe there would be some kind of application to do this?

I've done this before on the Palm OS Treo, and I believe it's actually duplicating Blackberry functionality.

Check out AE Button Plus

I don't think AE Button Plus will do this. I have AE Button Plus and while it's an excellent application, I don't see anything about using it for shift or option key strokes.

MagiKB Lite should do the trick, but it doesn't work 100% for the Mogul. It was originally written for the Treo 700wx but was rewritten for the Mogul. So far it's only mapped for the letter keys, so the option keys like comma, semi colon, etc won't work.