Thanks so much for the response.
(2) this is possible by overriding planetype properties but, as the game takes place in the vicinity of an aiport, most planes are below FL100 already so 250KT is the default limit
Controllers can generally give speeds higher (within aircraft limits) - I think 290 knots would be a reasonable cap.
(6) the distance will be reduced from 6 to 4 miles for more convenient waypoint selection
Could this be something customisable? It would be great to be able to set.
I'd like to specifically ask for your thoughts on 7, 9, 10, 16, and also 18 which I added as it's not an insignificant part of controlling a terminal area.
Thank you!