Adding the option to view all assignments by marking period or semester, in addition to previous/active/future/range. Teachers want to be able to see all assignments in the current "range" without having to enter the date range each time they browse away from the page.
I hate wading through all of the old assignments that are completely moot with the new semester. The "previous" option should only show the current semester, like the gradebook. Or have another option off to the side that is "current semester" and "one month". The range option doesn't do this well. You have to type dates every time you enter the window in a new class period.