I'm sure this has been put forward before but a quick search did not find it, I did however find a Rootsmagic 4 discussion on the Groups Sidebar started by Jerry Bryan.
Presently the Groups sidebar does not sort the entries by Name Birth Year, it should and must in future.
This is not so obvious as the Groups Sidebar does not display Birth Date and it should.
The same options of displaying Alt Name, Birth Year and Record Number should exist on the Groups sidebar.
I would also like to see and have the option to display the death year in both the Index & Groups sidebar.