It seems that trees are considered part of the terrain for placing buildings. this is pretty annoying, because usually the land will have so many trees that I can't place a building anywhere but, but when I do, the building quickly destroys itself. I suggest that trees be discounted for buildings, only being considered for *ships.
NB you can remove the trees by editing the ground.
But it might be a nice thing to do tree-felling automatically.
Yea, please add that auto thing. It should not be hard, but it would be very nice!