Changing color with priority
If the color of an indication sign was changing with different priority, the overview of the most important/urgent tasks would be better visible.
That is e.g., for priority 0 = grey, 1 = black, 2 = green, 3 = red (similar to the color of the circle indicating the different status: completed, overdue,...
With a bit more work you can do this yourself right now by creating (sub)categories for low/medium/high priority and then assigning different colors to these categories. The disadvantage of this work-around is that you have to manipulate both the priority and the category of a task so I'm not suggesting this as a permanent solution.