Relocating Pretty Plugins menu

At times we need to relocate certain menus to the Settings menu to tidy things up. This is typically a pretty simple task, but I've run into a strange issue with the Pretty Plugins plugin. To relocate this menu I used the following code snippet:

add_options_page( 'Plugins', 'Plugins', 'manage_options', 'pretty-plugins.php');

This usually works just fine, but with Pretty Plugins it seems to create a window within a window, which is strange. My guess is that it has to do with the way the plugin is written, but I assume there's a simple way to relocate this menu as can be done with any other plugin.

Any ideas?
Thanks!