The link that you posted is the same as the link that I posted, so yes, they're the same remote. :)
So I had previously set that up for the volume keys and it was working fine. I realized after your post though that I hadn't tried it with the channel keys -- I had assumed that meant it was for the channel up and channel down button only.
But... I reprogrammed it again (using option A1 to always send channel IR signals for a specific device no matter which device is currently selected) and it did change the channel up and down as expected, AND it also punched through the number keys!
So now, the remote is no longer sending out AT&T IR signals unless I've specifically picked the AT&T device button. It looks like it is now sending out "standard" IR signals, so I'm able to program the number keys, channel up/down, play/stop/ff/rew, etc.
I notice several keys that don't send anything at all except in AT&T mode (Back key, yellow/green/red keys), but I think I just need to program in a device that actually uses those buttons. It may or may not be possible, but the majority of the keys work at this point.
Thanks for all your help - If you aren't getting paid to do this, you should be!
Eraf