It would be helpful for instructors to compare groups' performance on more than one assignment.
For example, in a course where students work in teams, it would be nice to see at a glance, how has team 1 performed this semester? Team 2? etc. An average would be a good start, or something that weights the performance according to the value of the assignments would be even better.
A similar idea was posted here with a course coordinator/administrator focus: Grade analytics across groups.