Ability to totally control the time of the day/night and its speed, aswell as air and track temperature, cloud and rain levels, also why not the possibility to choose a % of randomness to spice the whole thing up.
[Staff Edit - Forza Motorsport has dynamic weather and time of day options. If you’d like to control these in ways the game currently does not offer, please create a new topic in Environment This topic reached 12 votes. - T10MM]