Is there a way to get courses autodeleted by the LDAP enrolment or shut it always be don manualy.
Courses are never autodeleted in Moodle (as far as I know). so you should do it manually (or with the help of non-standard extensions that have been posted here in the forums, to do bulk course operations).
Witch one of the plugin modules can I disable in auth. and enrol.? We are only go to use LDAP auth. and enrol.
LDAP auth and enrol plugins don't depend on any other auth or enrol plugin, so you can disable all the rest, except 'No login' and 'Manual Accounts' auth plugins, that can't be disabled.
Saludos. Iñaki