Vista - Vista Network Location Awareness and DUN

I have a client who is about to deploy Vista to its business and one of its
legacy desktop apps is a client dialler which uses DUN to connect to server
services. The application works but NLA kicks in upon connection. The users
of the application can only select the PUBLIC profile and what we would like
is to bypass this prompt in the first place since it can only lead to
confusion. I have had a look at the Firewall Policy and can't see anything
there which would allow us to say "whenever this DUN connection is made" or
"whenever a remote interface is connected" apply the public profile without
prompt.

Given that the profile being assigned is the most restrictive I was hoping
there would be a way to bypass the NLA prompt?

All thoughts gratefully received.

Remy