Hi Joe, thank you for taking the time to provide such thorough feedback.
We addressed a couple of issues recently with the CGE, after a bug was reported here: Collision Groups Editor unable to select proper group. The bug in the video snippet you recorded should be fixed with that update, please let us know if you’re still encountering issues.
This won’t be the last time we update the CGE, and I’d like you to know that your feedback is valued and will help us in development of future changes to the tool.