as for the TexTools reference, read more here: http://renderhjs.net/textools/ In particular the extend canvas (hidden under 'Tools') will make it very easy:
That looks great you should submit it to the official submission page, the deadline was extended slightly. http://www.polycount.com/forum/showthread.php?t=82832
people that consistently have no clue they're working with a team of people and that the project extends further than their PC. They should be set on fire. And then pissed on.
@Justo Thank you! UV Sync is a very specific feature of the Blender. It synchronizes the selection in the editing mode and the UV editor. Addon extends this functionality.