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I've just tested it, and you can set 2 additional priorities by clicking the patrol with the "prioritize patrols" tool selected. If you click a third time, it will revert back to default (low) priority.
 
That works for patrols, and it works for "Prioritise area" for janitor and gardener, but it doesn't work for "Prioritise area (guard)". I've tried clicking on the area, the icon, and right-clicking the area and icon, but nothing seems to work.