This idea has been developed and deployed to Canvas

The Grade Center can be viewed and filtered by student group. This is great!  However, when the teacher attempts to use the Speed Grader to grade the hundreds of students in the course, there is no way to filter the Speed Grader by Student Group. The only way we have found is the onerous process of also creating sections.  Groups seem to be imported automatically for viewing in the grade center- but this does not carry through to the speed grader.