SC2Mapster

Here's how it works.  There are several auto-generated points (main1, choke1, nat1, towerA, ... )  You can also add arbitrary points to your map and name them.  Then you specify exactly the network of shortest paths you'd like:
main1 gca main2  (that's ground, cliff and air)
choke3 g choke4

So they can form whatever picture they want