restarting samba 3.0.4 to remove user from group?

[Doelker, Rainer]

asking for a customer of mine:

My System:
--------------
Debian-Woody with a lot of Backport-Packages:
kernel 2.6.5-1 
xfs: #define XFS_VERSION_STRING "SGI XFS" ??? 
dmesg: SGI XFS with ACLs, no debug enabled, 
       SGI XFS Quota Management subsystem; 
mkfs.xfs version 2.6.11 
smbd/nmbd 3.0.4-Debian
Background skripts to replikate users, groups, 
   a directorystructure and permissions from Netware/eDirectory
   to Linux/Samba, so Linux can operate independent from Novell.

 If you register an user in a group (/etc/group), samba does not 
directly grant access to the files according to the group membership. 
A simple logout/login doesn't help. You have to restart samba
(/etc/init.d/samba restart) to give the user access. 

 But if you remove a groupmembership of a user, its not necessary 
to restart samba. If you log out and log in, you have lost the 
permissison, that the GroupMembership grantet.

 Is this a bug ?? Is there a workaround ? 
Will sending SIGHUB reload the groups as well?

thanks and regards, Rainer