I can't think of a way. If you're using Active Directory, you should be able to use the User Pricipal Name (user@domain.com).
If you don't specify a domain, the system will look locally for the user account. If you're doing this for only one user, just create a local account on the system.
PSC
Governments and corporations need people like you and me. We are samurai. The keyboard cowboys. And all those other people out there who have no idea what's going on are the cattle. Mooo! --Mr. The Plague, from the movie "Hackers