Based on trying to read through this forum post, http://www.dslreports.com/forum/r26093522-Uverse-3600hgv-in-pass-through-mode-
it does not appear to be possible to do what you wanted to originally.
You should be able to turn off the dhcp server on your router, and have those request passed to the att device so your router is basically a wireless switch. All devices should be able to access each other wired and wireless if your router is setup properly. I have no exp with the options on the 2wire devices, but would imagine it has all the basic stuff, except possibly ddns.