Hi Philippe and Frederic,
you are correct, starting from v4.2 (which is yet to come), the management of AD/LDAP will be removed from the admin UI. Note that we don't prevent users from creating the functionality by themselves, but from now on this graphical tool will be reserved for users of the Enterprise Edition. Another option for you would be to stick to v4.1 since it still has this functionality.
Regards,
Cedric