Perhaps I should speed up the helicopter turning speed, although I'll have to rebalance everything else in response to that (initial fire frequency, fire spread frequency, and number of trees are all factors). And thanks! More helicopters would be interesting, though it loses the elegance of being able to control the entire game with left and right clicks. If I could get multiplayer working, I think it would be really fun to cooperate with others to put out scattered fires over a voice chat!