Geography

[UnifiedDoom]

Also, as for myself, I just want to observe where this discussion is going. But I also thought, that this is less a problem of the map layout, but more one of the offered choices. Maybe some kind of mechanism to cross cliffs or similiar.
As you have said yourself, changing the terrain in an attempt to change this, would be quite some work. And I guess you also know, that there is the possibility to enable fog of war, but just want to activate it per default, right?

Fog of war would cause many consequences I doubt anyone could forsee, and I know many players already have a vendetta against Fog of War. While I feel it could add some interesting aspects to gameplay (perhaps even items and tanks based entirely on fog of war, I discussed this somewhat in the hardcore mode thread) and would like to add to default, but not immediately and after a lot of beta-testing and balancing.

You are right in assuming it is the offered choices, since earlygame ganking for me anyway is almost out of the question without a flying tank. But my main point is that you can always get behind the laner from mid in the unsafe lane but it's physically impossible to get behind them in the safe lane from mid without passing them from the front first and most likely being seen. The Fog of War would allow a player to make that frontal pass unseen and attack them from the side or even behind. The Fog of War might even cause countergankers from the enemy team to intercept a ganker from mid another interesting aspect of gameplay.

My other solution (which I now believe to be the best) was simply to make all cp tps invisible to the enemy team so that a gank via tp would not be so easy to spot without the minimap.