There isn't a 14k ridge between countries, it is only around the tank town crater in the center of the map. This does mean there is not a "fighter town" area where all three countries have adjacent fields and so can easily furball in one spot.
The border mountains between countries have valleys running through them that never rise more than 2K higher than adjacent airfields. Even a C-47 can make the trip through the mountains in about 8 minutes. The valleys should tend to concentrate fights across the front line into a smaller area so there should be some good furballs.
I've tried to make a map that has something for everyone, including GVers. So the tank town is as griefer proof as I am allowed to make it. It is hard to bomb, hard for one side to take over and harder still to keep once they have. OTOH I don't have SPs running from everywhere to everywhere like on some maps. GVers have to take V bases behind the lines to get access to most airfields. So taking these V bases is strategically important to land grabbers. Personally I find fights over V bases generate some of the best furballs as neither side can either vulch or keep just reupping and getting back into the fight instantly.