This may be a bit esoteric but it likely applies to a fair number of players and I've found it to be a common issue for my play style. Say you have several stacks scattered in a small area that you want to direct to a target. Say there is some artillery in there and you want to make the artillery attack position your base position. Ok, circle the stacks and position according to artillery range. Now split the selected stacks to move all but artillery a bit closer to the target. When you do this split, the current route you just set doesn't show up, so you can't tell where exactly the artillery are going to stop. It would be nice if that path that you just defined showed up after you split your selected units. Obviously, there are other ways to achieve the same goal, but this would be a nice quality of life improvement.