I'm running Tomato on a Buffalo router -- no problem so far.
Any particular reason why you needed to go through RT LAN to WAN? It's practically the same as RT WAN being connected directly to router LAN, without the dummy switching on the RT LAN.
I simply hooked up mine the way I have always hooked up ATA for years with no issue or any port forwarding needed:
Cable Modem -> Router -> ATA's WAN Port.
Also, instead of setting the static IP on the RT, just leave RT in DHCP mode and set the DD-WRT to hand out static IP to the RT. No need to manually set DNS server on the RT either.
EDIT: I read the original thread, and errr... well... if that works for you, great! (to quote DSLR: "on second thought, I do not wish to post").
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