samba - Sep 2008 - Samba PDC + Kerberos

Hello everybody,
  I'm looking for some suggestion how to kerberize SAMBA, let me explain 
I have a Windows 2008 Enterprise Server (will be used as terminal 
server) and a Samba Server as PDC. What I want to do is logon to the 
terminal server using samba, I've already put the win server into the 
samba domain and everything is working; but I want to kerberize samba to 
avoid different password (smbpasswd for instance).
Is it possible?What I have to change in smb.conf?

Thanks
Fabio