In Argentina is pretty common to have this kind of tracks:
http://www.youtube.com/watch?feature=player_detailpage&v=4475yb-zPD4#t=207s
https://www.youtube.com/watch?v=A5fqj0cxoHk&feature=related
I do understand it would require too many resources to simulate the dust. But having a simulation for that kind of surface would be great.
Kart rally cross. Pretty cool.
it would be pretty easy to make a dirt course.
but i dont know if the phyiscs would be right...Try it out.
yeah blah ...