Windows xp Build customisation

Hi all,
I am developing an win xp build for corporate deployment, and have been asked to provide the build with the Classic Start menu. Easy I hear you say! Well, I have tried the Gpedit option which forces the classic start menu. But we want theusers be able to switch to the *new* Xp format start menu, when/if they want! So basically they get classic menu to start off with, but have the option to change.
It will be used within NT4 domain.

Any tips much appreciated.