Adds needed functionality to WordPress.

I found this to be a very useful and well developed plug-in. I would quickly recommend it to a friend. The reason for the 4 stars (and I would have given 4.5 if it was possible) is it doesn’t allow menus to be visible/invisible by group. The work-around is to create a page which belonging to a group and add that page to the menu. It would be SOOOO much more convenient to be able to specify that a menu choice belongs to a group.