Use the following hack in your WordPresss theme’s function.php file for automatically adding all trackbacks into comment moderation list.
function mdv_moderate_trackback($approved) {global $wp_query;
if (1 == $approved && $wp_query->is_trackback)
$approved = 0;return $approved;
}add_filter(‘pre_comment_approved’, ‘mdv_moderate_trackback’, 20);
?>