There's a 3+ year old post here in suggestions mentioning possible reworks for the way the game handles prop overspeeding. I think that post contains some very good ideas as to how xml settings could be implemented to give us designers more control over the way our aircraft are meant to behave. Now that we have heli rotors I think it is even more apparent that overspeed behavior and the way we can interact with it needs an overhaul. Juno is cool and all but this game is still so awesome, it could just use some quality of life changes and a good patch.