I need to know if smoothwall linux supports multiple WAN interfaces... or if any Linux NOS does? It doesn't have to be dynamic load balancing, just general port/ip forwarding rules to assign different computers/typs of traffic on one WAN interface or another. Any info is helpful, as I am a Linux/networking ch00b.

Linux in general should... whether Smoothwall will be flexible enough to allow it is another matter. I suspect Smoothwall will be built with one WAN device in mind.

It might be better to get a copy of Debian, and roll your own.