Firewall/NAT

Is it possible at all to get m0n0 to rewrite the source IP on inbound NAT connections? 

I have two networks (call them Dorm and Campus).  Each network has it's own router already, and each has an independent connection to the Internet, so they are relatively isolated from each other.  My office PC is in the Main network, but I have gear in the Dorm network (wireless APs, switches, etc) that I'd like to get to from my office PC.  I'm looking for a small firewall/gateway package that I can use to port-forward from my PC to the stuff in the dorm network.  But it has to be able to rewrite the source IP, since the gear in the dorm net already has a default gateway.  Can m0n0 do this?

I saw CMB's post in
http://forum.m0n0.ch/index.php/topic,532.0.html
so I'm guessing the answer is "NO!!! Go away noob", but I thought I'd ask just to be sure. 

Thanks,
Dave