We use Tuleap with the LDAP plugin and ActiveDirectory. We have groups in different "OUs"/Nodes and we have nested groups. This is currently not supported by the LDAP Plugin - also the current method to distinguish between person and groups is only working because of the current restrictions.
To solve this only small changes to LDAP_GroupManager.class.php and to LDAP.class.php are neccessary.
May I create a pullrequest?