Support use of personal X509 certificates

From a user:

I use your HTTP authentication module in conjunction with personal X509 certificates for securing my site. To do this, I have altered it as follows:

       function check_remote_user() {
               $username = '';

               foreach (array('REMOTE_USER', 'REDIRECT_REMOTE_USER', 'SSL_CLIENT_S_DN_CN') as $key) {
                       if (isset($_SERVER[$key])) {
                               $username = $_SERVER[$key];
                       }
               }

It consists only of adding the SSL_CLIENT_S_DN_CN as one potential source for the identity. Is it something you could incorporate in future releases ?