|thanks for the tips. Can you point me to any info on connecting via WAN port (routing table, etc.) on the TC? I'd prefer not to use up one of LAN jacks if at all possible. But thanks for your suggestions, sounds like you know your stuff!|
You should really be using a switch for more ports, not a router. Switches require no configuration and you can get them in 8, 16, 24 (and more) ports. So if expansion is your point, do yourself a favor and buy a switch with more than enough ports (extra's to allow for growth right).
Having said that......
I don't "do" Mac/Apple so I can't help you with this TC thingie. What I can tell you is, every SOHO router I've done this with, and I've only done it for separate subnets and not for the same subnet, the route between LAN and WAN side was created automatically.
So, if nobody with experience with this TC device chimes in and offers advice, you're going to have to do it yourself. It shouldn't be that tough and shouldn't require any special routing since it's the same subnet. Just configure your WAN port as I've described the LAN configuration above.
You may have to then configure the LAN side with another IP in the same subnet (Something like: 192.168.0.3) and point the Gateway Address of the LAN side at the IP of the WAN side (192.168.0.2).
Again, I'm not sure, I'd never bother using the WAN port for connecting to the same subnet so I've never actually tried this scenario.