The show data from all children is very helpful in C360 reports. It would be enormously handy if there was an option to show data from all accounts in a hierarchy, especially since Gainsight seems to understand SFDC account hierarchy better than SFDC :)
Thanks for sharing, Blynn! Are you thinking of including sibling Accounts, or every Account in the hierarchy (independent of which 360 you are currently looking at)? Would also be helpful if you could share a scenario or two where this might be needed.