At the reIMAGINE 2016 and GPUG Summit 2016 conferences, I promised that a new build of GP Power Tools was coming and that it would have lots of great features.
[Update: GP Power Tools Build 22 was released in February 2017.]
Well, I have been working hard and have now completed the coding phase of the development. I will now be working on updating the documentation in preparation for the release of the build.