Version 2.2.2 was just pushed to add a parameter to the createGallery() function. This optional parameter will allow you to customize the value of the rel attribute.
Grab the latest build from http://www.ubergallery.net
Changes to 2.2.2
Detailed changelog: https://github.com/UberGallery/UberGallery/compare/2.2.1…2.2.2
