When grading any assessment (especially when mass-grading a Rubric or in the Gradebook), if a mistake was made, there is currently no way to undo or revert. It would be very helpful if there was an undo button.

For instance, when mass-grading a Rubric, you can select all students to change the status of an assessment. If instead you mistakenly enter a grade, all students now receive that grade, and there's no way to revert back to their previously entered grade.