Groupy2 include app but exclude specific windows?

I have Groupy2 (first official released non-beta) set to auto-group several apps using the "Only allow specified apps to be in a Group" option on my Win10 Pro PC. This includes Acrobat Reader.

This was working fine until I used Acrobat's Advanced Search which creates a floating window. Its "Arrange Window" option will put the Search and doc window side-by-side for easy searching, but Groupy2 prevents that by forcing each window into a separate tab.

For now I've removed Acrobat Reader as a Groupy item, but what I'd *like* to do is include Acrobat but *exclude" the Search window. Is there a way to do this, or could something like this be added? I looked at the Custom Grouping rules but only see a way to *create/include* items, not *exclude* them.