Yes, UNA doesn't have the similar option because it redirects automatically to the URL under it was installed. It is controlled by the function bx_check_redirect_to_correct_hostname from the file inc/utils.inc.php
Strange...mine doesn't auto redirect. I can type in non-secure address and it will bring up the site at http:// but images and icons are missing naturally because it's not keyed for nonsecure site only https
