For the itrip for the G1/G2 ipods, the "songs" that change the frequency of the itrip existed in a directory on the install CD. I didn't even mess with the installation program. I just copied those songs to my hard drive and made my own playlist from within MC. I wouldn't imagine it being any more difficult for the G3 itrips.
That's excellent news, and makes me much more hopeful!
So, correct me if I'm wrong, but, a step-by-step would be...
1. Put in the iTrip CD and cancel whatever pops up
2. Find the folder that all of the radio station "songs" are in, copy it to your hard drive
2a. For safety's sake, perhaps these "songs" should be made read-only? A little
attrib +r c:\music\iTrip\*.mp3 action, perhaps? That way MC won't futz with 'em.
3. Import these "songs" into your MC library. Put them all in a playlist/smartlist
4. Sync/upload your new "stations" playlist to the iTrip
5. Pick up the owner's manual and start reading it from the point
after the songs have been uploaded, because everything's cool.
Sound about right?