Topic on Extension talk:LDAP Authentication

I am able to log in using my AD account so I know that part is working. What I don't understand is what i need to do for permissions and groups.

Is there a way that I can use local groups in MediaWiki and just add AD users to that group, or do I HAVE to use AD groups and configure them in LocalSettings.php?

Here's my current config if that helps:

#LDAP Authentication Extension
require_once( "$IP/extensions/LdapAuthentication/LdapAuthentication.php" );
$wgAuth = new LdapAuthenticationPlugin();
$wgLDAPDomainNames = array( "MYDOMAIN" );
$wgLDAPServerNames = array( "MYDOMAIN" => "my.ad.domain.com" );
$wgLDAPSearchStrings = array( "MYDOMAIN" => "USER-NAME@MYDOMAIN" );
$wgLDAPEncryptionType = array( "MYDOMAIN" => "clear" );
$wgLDAPBaseDNs = array( "MYDOMAIN" => "OU=MyOu,DC=MyDC,DC=MyDC2,DC=MyDC3" );
$wgMinimalPasswordLength = 15;