This would be a great addition! I'd be handy if when levelling resources you could also set critical milestones or a deadlines for a particular task or tasks that have to be meet by a certain date. We have a team of seven spread over 20+ projects, 5-10 of which may overlap at any one time. It'd be handy if you could privilege some projects when levelling resources so the re-allocation of time doesn't affect those key milestones. It would instead re-distribute the hours for other tasks from other projects that overlap to allow people to focus on the critical milestones or deadlines that you've nominated.