After reading Bubby and the Ducted One, I see that it's simple, too --
If they had made the TRC780 able to be used as IR only, they could have saved some money, some confusion, and the $$$ that it costs everybody to get this sorted out.
rbhfan says:
As far as I have been lead to believe. The TRC-780 is made specifically for being a zone remote in a total control system and would use the mrx-10 to communicate to the total control system.
So, since it can be used as a zone remote, one can ignore its total control system capability and use it as a completely capable IR remote, right? In other words, it really DOES do what we'd want it to do and there's no need for a second model?