Yeah, agreed. Vehicles may get slowed down in woods and risk throwing a track thru the rough stuff, but "Serious Trees" should really make it impossible, so a 2 tier woods type is a great idea. I havent checked but is all the marsh terrain types useable by tanks, even at risk of getting bogged? I havent noticed the random generated maps coming up with impassable terrain, if at all. IMHO it would spice things up by giving infantry some "safe" ground from armour and make players, (and the AI come to that), rethink attack routes, defence lines etc. Currently you can sneak armoured cars, lorries, etc offroad through forests which doesnt seem quite right to me... Try turning off the highway and driving your car through your nearest forest and see how far you get
Maybe that would be tricky/ impossible/ undesirable/ all of the above to program in for random maps??