In WinXP when I connect via PPTP to a VPN I have an option in the advanced TCP/IP set up to *not* use the default remote gateway.... this means that when I'm connected to a machine with limited outgoing connections I can still browser the web, access IM etc from my machine.

In Internet Connect I can set up the VPN Connection with no trouble at all and access the remote host, but it then tries to route all traffic through the remote machine.... with pretty disastrous results !

Is there a solution for the OSX Internet Connect that will let me work the same way.
I don't know if it matters, but I'm using an Airport Extreme connected machine, not wired ethernet