Just imagine - you have a big wheat field infront of you - you know that a company is in that field - take a flamethrower and put one field up in flames
now every once in a while (maybe 1 min for a wheat field) all surrounding wheat fields will catch fire.
e.g.:
wheat field - 1 min
forest - 3 min
scattered trees - 5 min (trees are farther apart - should obviously take longer)
with such a spreading system you could have alot more tactics - for example you could get a very good smoke screen that would last a very long time. or you could, as defender, block certain passages that way.
But of course - these burning fields should also extingwish after a certain time - afterall -if it would stay their forever the other player would be at a major disadvantage!
a wheatfield could stop burning maybe after 2 min
a forst -after 5 perhaps
Just some "awesome" ideas i had
btw.. dont mind my numerous spelling errors - my native language is german(austrian) and its kinda late