I think there's a lot of potential for this in our larger courses, especially as a way to help randomize dividing/assigning students to TAs in the big, online courses (like a TA is randomly assigned to grade 50 students of the 300 in the course). I can see that I can filter the overall gradebook with differentiation tags (found under Student Groups), but that filtering doesn't seem to carry over when I launch SpeedGrader from there...which I was hoping for. I still just see all students in the course site.
If I change the course settings to launch SpeedGrader by student groups, I'm able to filter the gradebook by the differentiation tag variant and then launch from there and it displays the # of students I was looking for. This is the result I'm looking for but we generally prefer to avoid enabling that setting because it causes problems when a group isn't selected / shouldn't be used.
Is this something others are struggling with?