Don't have an immediate solution, but I do have an idea ...

The problem is that the NEO will not learn from the OneForAll remotes, which are the only type that currently support X-10. (I believe that their "on" state is too long for the NEO; it likes shorter batches of pulses from a quickly "tapped" key.) If we could get even ONE NEO to learn the 0-9/Dim/On codes for the IR543 Control Center then we could distribute them to the group via an NCF.

Now the good part: The "big" Prontos recently got X-10 capabilities through their CCF files (which NEOs don't use). If anyone can find a Pronto or ProntoPro user who has/can do this upgrade, then we could (hopefully) get a NEO to learn the codes from its big brother. Assuming that the NEO will learn from the Pronto, of course ...

Anyone out there know of a Pronto user who might assist? Maybe the folks at X-10Pro or SmartHome might assist since they sell both the Pronto and X-10 devices.