The extra caches the menu entry positions in a permanent cache. It restores the positions of known menu entries after a package installation. It also moves new menu entries added during a package installation to the bottom. That way only new installed extras change the main menu. The permanent cache can be updated with a menu entry in the manage menu.
The extra adds two menu entries in the manage menu to manually save and load the
menu entry positions. If you manually edit the menu, you have to save the menu