Guru,
On the profile screen of the modify user task there are two options that state user synchronization and account synchronization.
I suggest that you create a copy of the modify user task and call it ModfyNoSynch, on the profile of this new task set both account and user synch to off.
This will modify the corporate user, but will not Synch the changes to the endpoint. so the Name will stay as Bill Smith.
Thanks,
Bill Patton