In The Sprint it was shown that wind was implemented into the engine; this wind could make projectiles such as grenades, jumping spartans, etc, to fly in a certain direction. Originally this feature was created for Sunaion, which was to feature heavy winds and tsunami-like waves. It was later implemented instead on the opening-sequence of “Genesis”, in which you fight while ‘walking’ down the Guardian.
I’m suggesting that 343 implement this functionality to the wind settings(which at the moment only effect fog direction), as this would make for some really interesting custom games, and dynamic fights.