After untold hours of stumbling around with different settings, I think I might have stumbled upon a Eureka configuration worth sharing. I think its unique because I couldn't find anything on the web indicating that Tomato 1.28 could run a home wifi network the way mine is currently (wonderfully) running: two routers, both issuing distinct bands of IP addresses via their own DHCP (after WPA2 authentication), sharing an SSID, both sending and receiving in wireless G, both able to see each other's devices in their device listings, and with assigned devices switching over to the nearer of the two routers seamlessly. I am also getting my paid-for cable bandwidth out of any device wirelessly connected to this config... which, although not blazing (15Mbps down), is great!
More details of my setup: The two routers Tomato-ing as a WDS dynamic duo are a Buffalo WHR-G54S and a Asus WL-520GU. One of them is basically a DMZed IP on the AT&T U-Verse modem+wifi combo, and I have all the possible AT&T wifis entirely disabled (the less radiation, the better, right?). The two Tomato-ers both shut off their wireless broadcasting at night (again, less rads the better) using Tomato's nice time-based Access Restriction feature, and turn back on in the AM, syncing back up just fine (without me having to go to 'No Security', reboot in a specific order, then add back the WPA2, etc.). Finally, I am successfully port-forwarding a webcam (we're keeping a password-protected eye on a momma chicken's first attempt at hatching a clutch), from the MORE DISTAL of the two routers, to the broader internet. Pretty sweet!
As per the intended format of this blog -- please comment if you'd either 1) Like to give a kudo; or 2) Would like to try and duplicate this 'success,' and want to ask me specific questions about the details. I've got a 'hunch' about what detailed settings finally got them reliably talking to one another... and hopefully, with confirmed successes, we can know that wasn't just the planets being in alignment!