I've done a search in the ideas list and i couldn't found this one but i apologize if already exists.
The idea is (and follow my chain of thought please): Activities should have a index (like 1,2,3 etc) for however their design in the flow.
We usually design the flow from top do bottom, conditcions, etc. so the top activity should be 1, the one after should be 2 and therefore. This would serve to ordenate the Activities in the Right Tree so that when we are at the top of the process flow and i click the 2nd activity i know that that that one is the second one. This can be more effective if you have very extended processes with a lot of activities.