I tried that and found it takes a massive hit each time they log on.
I am willing to give it another go now that my desktops are more powerful - can you send info to zel@zelandakh.co.uk please?
I suggested (this forum, another forum, who knows?) a while ago that it could be done by setting up any user once then changing the username key in the registry, but no one knew of a way to change the reg successfully.