Better yet (if its doable) do away with static asteroids. One of Newton's pesky little laws says that an object in motion will remain in motion until acted on by another force. So if the asteroid the size of a fighter gun isnt pushed aside... it must have some dimensional space location anchoring whatchamacallit. Or make asteroids destructable. No need to make a path if people can fly and make their own.
But alternativley as already mentioned, paths would be nice. No caps shouldnt go through asteroid fields on a regular basis... but when the only way to get out of a system that sells your caps (Say on Corsica for instance) is through an asteroid field... I dunno, my two cents I suppose.