Having the ability for the Goal Widget to sum by Group would allow me to track against multiple goals using a single column, which would be much cleaner than how I currently have to setup my board.
I track total implementation in my overview boards, which include different categories / Groups that each have a unique goal. To accurately capture each goal, I need to create an individual column for each Group. Being able to sum by Group would allow me to use a single column, instead of multiple.