Terminal Server and Client -Group Policy

I have a question in which I hope you can help me:

I have a W2k Server running Terminal Services. (Service
Pack 3)

I have users who use just a thin client to connect, and have grouped them with a policy so that they can’t do specific things such as access the tserver’s c: drive,
etc..

I also have a group of users who use a PC and sometimes connect via the Tserver to do things. HOwever, if I put these people in the same group policy, then when they are local on their pc, they are restricted as well.

What is the best thing to do so that I have a dual affect for the pc users. When their connected, they are restricted, but when their local, they are not restricted.

Thanks for any advice or help.