I made the changes to usbradio that you suggest about a year or so ago, and it worked ok. However I was just getting started with app-rpt, and there were some other little issues I was having. I decided to mod the cm108 device and see how that compared. Unless you're using the recommended hardware/software, it's really hard for anyone to help.

I'm also interested in such a driver. I'd really like to continue using my IRLP board, but I can't seem to make app-rpt work with it directly. 73, Kyle K0KN