[Samba] how to disable roaming profile on win2k?

[ksc133]

dear sir,

i've configure a samba PDC on a RH7.2.
my windows client can logon. but i like to disable roaming profile on 
the win2k.
presently i disable roaming profile on the win2k itself.
but i like to configure samba PDC to do the job instead!
pls help me on this.

another is that my samba users when logon to win2k. all became 
restricted users!
even root account! now i can't even shut down the win2k.
anyway to over come this problem?

thank q