I have been thinking about this a great deal for the radio stack for the GA panel I am planning.  I think that the best thing to do would be to get radio componants that change frequencies in the same manner as the FS radio and arrange for the dials of the radio to operate the radio within the FS.  This would probably mean that you need to recalibrate each time you start up the sim.  I'm still working on it though, and it may need seperate software to run.  I'll have to chat to John about programming for the whole thing.

The FSUIPC SDK came with a patch that appears to allow you to change all key press functions within the sim to analogue functions, this would allow the use of a potentiometer to change frequencies, heading bugs etc.  I'll do some more work and post the results later.

Will