Just to let you all know, I got the remapping to work great on my Mk1. If anyone else has the steering wheel remote, here are the IR codes:

Steering Wheel Remote
DEC,HEX,FUNCTION
47380,0000B914,Vol-
47381,0000B915,Vol+
47371,0000B90B,Track+
47370,0000B90A,Track-
47373,0000B90D,FF
47372,0000B90C,Rev
47382,0000B916,ATT
47379,0000B913,SRC

Thanks again, Frank, for all your help!
Jason

_~= Dearing =~_
"WAY too happy about having #99."