LDAP Delegate: Allow auto-group-join for defined ldap attributes

When using a LDAP Delegate Directory in Crowd, it would be handy if users would automatically join groups depending on their LDAP attributes.

At the moment you can specify groups that all users will join automatically.
I want to add groups that are being joined by users that have specific key-value-pairs in their LDAP attributes (e.g. memberOf=... or department=...).