I don't understand the issue.  The thread linked above lists Pronto Hex for all of the functions available on the Comcast remote, excepting volume+/- and Mute.  These last three functions are not implemented in the RNG150.  In other words, all of the useful buttons are listed.  Frankly I have to wonder if you have really looked at posts 11 and 16.

Are you not able to enter Pronto Hex into your Pronto?  The wikidot info is not in a format that is useful to a Pronto Remote, but the above linked Pronto Hex is useful.