Chris - Sounds like we need more testing to determine if RP locos are always responding to functions in a consist.  If so, then it will need to be patched.
I tested on a friend's Digitrax layout yesterday briefly.  Initially I had a hard time getting the DCC controller to recognize the locos, but then I realized my mistake(s).  First, I forgot to "save" the locomotive on the HC after I enabled DCC.  Second, I had the locomotive still pulled up on my HC while trying to access it from the Digitrax controller.  Exiting the locomotive control page solved the issue.  I didn't play much with it after because I only wanted to determine that it would work.  I didn't try consisting with another DCC locomotive, but I'll test that next time.
-Kevin