samba - Dec 2010 - how to let windbind to use LOCAL groupmaps?

Hi,

I'm trying to join ?linux machines to AD domain with the help of winbind.
In order to make account managent more easier, I want to create
corresponding group maps from every linux native group, then join
domain users/groups to the new LOCAL groupmap.

At present, BUILTIN groupmap works fine with the steps:

net groupmap add sid=S-1-5-32-544 unixgroup=admin
ntgroup=BUILTIN\\Administrators type=local
net sam addmem BUILTIN\\Administrators ?'dn\domain admins'


But, LOCAL groupmap doesn't work with the similar steps:

net groupmap add unixgroup=admin ntgroup=ntadmin type=local
net sam addmem ntadmin 'dn\domain admins'


I'm using Ubuntu 10.10 with winbind 3.5.4, no smbd/nmbd installed
How to let winbind to use LOCAL groupmaps?


Thanks,
dragchan