working with LDAP authorization hook While I have been able to use the LDAP authentication hook 
(hook_ldap_authentication_allowuser_results_alter) to perform additional authentication,
I have not been able to use what I thought was the LDAP authorization hook
(hook_ldap_authorization_maps_alter, defined in the LDAP authorization module, file ldap_authorization.api.php) - the hook never gets executed.

The purpose is to assign user roles to newly created, LDAP-authenticated accounts (therefore I need a Drupal ID). We can't currently use LDAP-Drupal user role mappings because our LDAP does not contain the necessary information to determine the role; instead we need to tap a different database to determine this, and I was hoping that there would a hook somewhere during account creation.
I've been down this route a few times (looking at using LDAP integration module) each time I ended up writing my own LDAP integration.  Everyone implements differently, I just take the pieces I like from the LDAP module out there (6 or 7) and use your own code to do it.  As a general rule, anytime the rubber hits the road with integrating Drupal with user authentication / authorization systems in an organization I brute force them together via a custom / forked module.  You'll always know your own auth system's specific needs, D.O. will not :)