Well, if anyone could be bothered to edit the map and reduce the amount of forests that would be an interesting idea. I don't like the idea of no forests in all the ancient world; that would be stupid for obvious reasons. But since we can't actually choose our battlefields as much as we'd like, we can simulate the idea that commanders would rarely choose to fight in forests, and so place fewer on the battlemap. They'd still 'be there', just we wouldn't see them in times when they are most annoying.