Director Level
I think it would be useful to be able to add a director level of management into the hierarchy. What I mean by that is some allow managers to be over (and even members of) multiple departments that report to them and grant them access to view all of their own departments requests. This feature could even span over multiple sites as these directors may have departments spread over 2 or more sites. It seems to be already semi-implemented per the "Organizational Roles" section, but that is mainly for building workflows.