map mechanic idea: mountain passes

[paradoxharbinger]

so, was thinking about options to put into mapgen and mulling over the idea of ports and bridges, which have already been seen in some maps, when i thought of a similar mechanic for mountains, with it's own special tactical twists.

the mountain pass would basically be a very small province, or chain thereof, which could be used to cross a mountain range without actually entering the mountains. the twist is that the army in the pass may not enter the mountains to either side, but an army in the adjacent mountain territories could descend upon an army sitting in the pass. i believe it's possible to mod one-way movements between provinces (there was a discussion about it somewheres i think). the army coming through the pass would never know an enemy was in wait, owing to the fact that from the pass, the neighboring mountains are not neighbors at all, greatly increasing the need for scouts, while those waiting to ambush could see them all the while.

well let me know what you think of the idea, i think its pretty sweet myself, but thats just me.