[Dovecot] Multiple Mailstores using 1.0alpha4

I am using qmail-ldap to provide virtual users to my system, but I also have some shell users on the system as well.

Virtual users go into /home/vmail/mailstore/$username/ System users go into /home/$username/Maildir

How can I have both of these available as inboxes in dovecot using ldap logins?

Do I need to use namespaces or am i missing something with default_mail_env?

Thanks,

Brian T Glenn delink.net Internet Services