[Sifer2]

Regarding your first comment about choke points I thought this might be another good time to mention the idea I had in another thread.

That is something like limiting aerial movement combined with mountains an other terrain to create front lines. I suggest something like anti air missile facilities that can be controlled an create no fly zones for your enemy. That can be hacked an taken out to open up aerial routes. Though to control them you might need to also own the nearby base.

But the basic idea is that it would cut down on the ability to just fly right over the enemy an paradrop into a base. You would instead have to fight your way on the ground first making terrain more of a factor. I think this combined with the right terrain design would create those large battles. An also spread fighting out instead of it always being centered around a base.