I tried the new map script (creation.py) -- pretty neat!
I had an idea after my first attempt at using that map. I ran the Khazad and found myself bottled up since Barbatos occupied the only square out of the dwarves' extensive network of mountain valleys. To make matters worse, Acheron also decided to set up shop a couple squares away from Barbatos, making this a truly rotten neighborhood early on.
Anyway, the idea was a unique terrain improvement for the dwarves that would allow them to build a tunnel to reach the other side of a mountain. This would be pretty useful especially with the style of map that creates long, impassable strings of mountains. Only an allied Civ would be able to use the tunnel besides the dwarves. Of course, with a moderately high Armageddon rating, the occasional Balor (orcs? goblins?) might spawn out of the tunnel.