Found another useful tool for uv editing mostly but it can do some other stuff - and its free (for now). - Maya 8.5 up

Its called Diamant Uv 2.0 Beta

Info from the site:
Diamant Uv is a fully functional and fully integrated Automatic Uv mapper and editor for Maya. Diamant Uv was built for production and ease of use. Because of this, it features a multitude of tools to help get around most of the tedious workflow's that users are accustomed to. Diamant Uv has been tested in some of the top Game studio's in the world. It was built with production in mind and should finally make Uving a fun and enjoyable experience for all.

It even has some training videos.
You do have to reg to get it (again free) and then its in the forum, but its worth it

https://tools3d.com/news.php