So often, I will have selected all the units I want for a mission, and will then think to myself "I want these guys in a squad". Then I go to create a squad and...have to manually find them all in the list. I know I am not the only one, since ChristopherOdd does the same thing in his LW Let's Play videos
It would be nice having a "create squad from selected units" button, which would make a new squad with the currently selected active units as it's default members.