Filter for exclusion as well as inclusion
Right now you can use filters to *show* one of the selected options along multiple dimensions (role/user/quadrant etc.).
Very often my use case is to see *all but* one of the options for one of these dimensions. It would help a lot if the filters could be toggled to exclude rather than include.
A more complete solution would be to allow multiselect, but that may be quite a bit more difficult to implement. The simple toggle also would go a long way.