This idea has been developed and deployed to Canvas
It would be EXTREMELY helpful to be able to filter submissions by section in the mobile teacher app. Right now I have no easy way to see who has and has not submitted their assignment because ALL students in the course show up at once. I even see all students in the course even if the assignment was only assigned to one section. My policy is that homework is due at the beginning of class and I need to know in the first minute or two who has and has not submitted.