Still going... Only getting half an hour here and there to work on it and each bit means quite a bit of research on ActionScript.
Testers please, to ready yourself. - make sure you have web orbiter installed and running well and you know how to get ssh access to your chumby and stop the control panel (all this info is on the Chumby wiki).
I finally got external configuration working last night but then had to go to bed, so I will try and post the swf file and instructions tonight.
At the moment everything is working well except my exit button. This does not work and I have no idea why. Anyone that knows actionscript is welcome to help - I have tried using fscommand("quit") but doesn't seem to do anything.