It would be awesome if there was a way to add a modal popup of the condition builder for Groups.

Most people probably don't even realize they can set conditions on Groups, because "Relevance equation" leaves a bit of ambiguity...

But if to the right of this field, there was a button called "Set Conditions", that used the same functionality available for questions, and upon closing the modal window, the conditional equation was inserted into the Relevance equation field, I think this would empower a lot of survey builders to be able to so much more easily apply conditions at the Group level, instead of at only the question level.