More theme suggestions on layout extensions

Omega 4 has introduced layout extensions which is used to replace page.tpl.php in my understanding. Drupal core does not only provide page.tpl.php but also some variations such as page__node.tpl.php and page__node__%.tpl.php. I tried to add simple-layout__user.tpl.php in simple layout but no luck. Is it possible to add this feature in coming release?