dovecot - Nov 2009 - multiple connections per imap/pop3 process in 2.0

When I set this in master.conf:
    service imap {
      service_count = 5
    }
I see this error when two imap users log in:
Nov 11 16:54:16 server dovecot[5432]: imap-login: Login: user=<user1>,
method=PLAIN, rip=10.100.0.84, lip=10.80.0.163, pid=5573
Nov 11 16:54:31 server dovecot[5432]: imap-login: Login: user=<user2>,
method=PLAIN, rip=::1, lip=::1, secured, pid=5573
Nov 11 16:54:31 server dovecot[5432]: imap(pid 5573 user user2): Fatal:
setgid(2002) failed with euid=2001(user1), gid=2001, egid=2001: Operation not
permitted
Then both users are logged out.

Is there another setting I have to change to enable multiple connections per
imap/pop3 process in dovecot-2.0, or does it just not work yet?  I tried
changing client_limit=5 but that had no effect.  (I suggest that master.conf
needs more documentation.)  Thanks.

On Wed, 2009-11-11 at 19:18 -0600, Mike Abbott wrote:
> Nov 11 16:54:31 server dovecot[5432]: imap(pid 5573 user user2): Fatal:
setgid(2002) failed with euid=2001(user1), gid=2001, egid=2001: Operation not
permitted
> Then both users are logged out.
> 
> Is there another setting I have to change to enable multiple connections
per imap/pop3 process in dovecot-2.0, or does it just not work yet?  I tried
changing client_limit=5 but that had no effect.  (I suggest that master.conf
needs more documentation.)  Thanks.
It currently requires that all users have the same uid and gid. If you
want the same process to handle multiple uids/gids, you pretty much have
to run it as root that just temporarily drops privileges and that seems
a bit dangerous to me.

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