Problems with Vista Network routing

In the office I'm connected to a network that contains a default gateway to
the rest of a internal Network (that contains other services like mail,
internal portal, etc.). But, like me, several other collegues have a VPN to
access de Internet (outside network).

The problem is, with Windows XP it allows us to have 2 default gateways,
allowing us to reach the Internet without any trouble. But with Vista the
following problem ocurs:
- The connections dialog states our VPN connection has not available with
the message "This connection requires an active Internet connection"
- After manually starting the conection in "Control Panel->Network
Connections", it states as "limited connection" and does not allow us to
reach the Internet. After awile, it drops the connections.

The workaround so far, as been:
1. Opening an Administrative privileged console
2. Deleting the default gateways (route delete 0.0.0.0).
2. Adding routes of internal networks to our internal gateway (route add
x.x.x.x mask x.x.x.x [internet GW IP]) by hand or script/batch.
3. Starting the VPN connections.

Is there a simpler solution?

Best wishes
Jugger