Oh cool
Actually I was going to say that you COULD do that in code, but if the app doesn't support it then Windows will use the "preferred" interface which would probably always be the university over the 3g.
But of course if you wrote a program to intercept the packets and reroute them through a specific adapter... heh, well there you go.
I suppose a better version of the program would have a little UI that would allow you to setup "profiles" for different apps like a lot of game controllers do, it would then list the adapters by name and let you pick. In fact, you COULD write a little GUI to do just that and have it generate the shortcuts for that program...