When you say ".map files" do you mean the maps that come with the game? If you do I think that would be really really hard to come up with proper paths for mobs from this.
As an experiment I wrote some code so that when you attacked a mob in west freeport it would attempt to find a route to the player using a hard coded network of pathing points including going up onto the walkways around the entrance and back into a few of the buildings actually using the doors. It seemed to work quite well and feel similar to the offical servers. Of course you'd need a few hundred pathing points to cover all of west freeport. I just did about 50 close to the entrance, but it seems to work well.
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