Let's make that idea discussed earlier an official task ...
Stating the obvious: Configuring LDAP keyserver connection is error-prone. A simple typo in the long string of server, port, ou, password etc. will break operation.
That part cannot be changed as it's in the nature of LDAP. But Kleopatra should ease the job by providing a way to test a configured LDAP connection immediately. So that would be a "Test Connection" button that triggers an action fairly similar to ldapwhoiami. In my opinion this provides a great convenience in that fairly awkward area.
Another way to ease configuration was to configure the connection through separate input boxes for the components of that URL, I think this is already being worked on. Although I'd appreciate if Kleopatra could still accept a single URL and do the parsing, preferably using the ldap_url_parse function of libldap.