You would have to check your linksys docs. I know (I have done this with multiple routers in the past) bridge networks with routers and sometimes giving them almost a seperate 'subnet' but as far as restricting access that's up to the router that's 'bridged'.
Check to see what the linksys can do, I have a linksys I replaced with a TC and I'm gonna be essentially doing a psuedo dual band for my kids DS's since they can't do WPA2 networks, I have to enable a WEP network and that network only needs internet access. I think on mine I have a restrictions tab that I can change permissions on what's accessible, but again, I have to read the docs.
Let me know how it goes, as I may need to set up the exact same arrangement.
Actually, I see you are also in Atlanta. I'll pay you to come over and set this up.