Soup,
I had the same set up as yours before I switched to CH.
For some reason I could only get the computer (XP Home) and AH to recognize the TM RCS when I had an analog stick connected along with the rudder. As long as I had the old TM Top gun stick connected both Xp and AH allowed me to set up the rudder with no problems.
I had to do the same with my CH Fighter stick and throttle. Map the rudder in AH, ignore the analog stick. The analog stick is stuffed behind my computer outta sight.
You might be able to get it to work without the analog stick but I never could. Of course I just use the computer, have no idea what makes it work.