I tend to prioritize my tasks based on a set of standard criteria (e.g. urgent vs important). I use tags to mark the tags with these criteria, and let the priorities emerge. I'd love to be able to create separate smart lists with combinations of these criteria (e.g. important but not urgent / important and urgent / etc) and let the smart list automatically set priorities for the tasks it filters in. E.g. everything on the "Important and urgent" smart list would automatically be assigned "Priority 1" or some other tag of my choice.

If there's a workaround for this, please share.