The LDAPSearch component is fairly limited in what it can do, and beyond what's documented that's it. It is included in the SDK more as a working example than as a robust enterprise solution.
It is quite possible to query LDAPs using today's CGI environments, with the obvious benefits being native inclusion and near infinite flexibility. A few threads that might be helpful:
http://forums.aspfree.com/code-bank-54/asp-code-query-ad-ldap-169652.htmlhttp://stackoverflow.com/questions/7946856/user-authentication-over-ldap-in-asp 
