[Bman]

Could you not modify the data-files (systems.txt??) that are used by the random map generator to create systems: Put some empty systems in it. Then make a quadrant that favors these empty systems (like say 50% of all systems are empty). Now, using the builtin map generator you can quickly get your map with lots of empty systems. Now you just gotta figure out a way to have the star-systems only have warppoints leading to the empty 'hyperspace' systems.