Wish: Action hook after successful registration

Hi, could you please add an action hook at the end of the successful registration. e.g.
it could be inserted at the very end of the else-block (in the clean-login.php of the plugin):

if ( is_wp_error( $user_id ) )
$url = esc_url( add_query_arg( ‘created’, ‘failed’, $url ) );
else {
$successful_registration = true;
$user = new WP_User( $user_id );
[…]
do_action( ‘cleanlogin_after_successful_registration’, $user_id );
}

This is needed in our case to control the default display_name of a registered user.

I would have posted this via GitHub but I couldn’t find a repository of the current version 1.9.4 (just 1.9.3 here: https://github.com/ahornero/clean-login/blob/master/clean-login.php)

Thank you very much for considering my wish.