In the New Gradebook, it would be great if you could apply a status to all students in a course with one click. So in the (crude) mockup below, clicking on the top of the status column would change the status for all students with one click. 

Use cases: I did an "on paper" assignment in class and every student turned it in. I want to apply a Turned In status to all students. Or if you have an external tool assignment that most students did not turn in, I could click M for all students and it would mark everyone missing. Then I just click on the few students that did turn it in.