Thanks for the information.
I studied the lib-auth.php and admin-users.php today and wrote the GUI-component (extended the admin-users-page) to add LDAP-Users to the local DB, but authenticate them against the LDAP-Server at the Login. Maybe i will extend it to import the users from a whole ldap-group..
Well, a few changes need to be done regarding user-management, but i'm looking forward to complete these tasks during the next (2) week(s).
Can i contact sbillard in some way (pn,mail,ticket,..) to talk about this feature? I would like to contribute it.