Would be nice if you guys added a hook (that also sends the $post_id, $widget_id and $sidebar_id as arguments) to the end of the of the pw_ajax_save_widget() function. Maybe something like this?
$arguments = array(
'post_id' => $post_id,
'widget_id' => $widget_id,
'sidebar_id' => $sidebar_id
);
do_action('wp_page_widget_save', $arguments);
