Clicking on a person or a project to filter by hides any items that aren't relevant to that filter. It would be nice to have the opposite; a way to specify a tag to filter out.
For example, there would be some modifier key or shortcut to click on a filter, and that would show everything but items that are relevant to that filter. That way I can filter out/exclude one or multiple users from a team board and only see the items of the users I didnt exclude.