I would love to see better wind modeling in game. I don't think they could get it as granular as reacting like a fluid, but having it provide updrafts over appropriate places and placing areas of turbulence where they should be would be pretty snazzy. Stallfighting in a canyon could have a pretty different feel with a crosswind and updrafts in the appropriate locations.
Being that there's already a capability for the game to deal with wind, I wouldn't think it would be that much more intense to have it calculate the wind zones when you load a map. Once created, they'd be static locations, right? Maybe vary the direction and strength of the wind when the map is first loaded so people don't get too much of a feel for where exactly lumpy air is going to be.
Wiley.