Hey.
You can use User Manager for Domains on client PCs. There is a kit with a variety of utilities on it, I think its called 'Power Tools'. I don't remember where exactly I got it, maybe it was on the Resourse CD or the MS website.
You could also at MASSIVE cost use a Citrix server, and connect as administrator, using a published desktop. this allows you to do everything remotely that you can do locally on that server, including that which you mentioned.
But I don't seriously suppose you spend that kind of readies for that but if you have other reasons for using the power of Citrix, problem solved, just got to get ££££££ passed your Financial Director!!
pritch.