Hmm... defense/countermeasures...
Well, before we look at countermeasures, let's look at this scenario, from the attacker's perspective:
You want to irritate another player or get them away from your set of sectors, or reset their spawn sector. They have set up x amount of stations...
You warp into a sector in your battleship, toodle around looking at everything (not getting attacked by the opposing player's ships of course because they see you as neutral), then finally move about 50 km off...
You position your ship to stay in one spot, and calculate a jump. Then, you exit into your drone, found a ship, apply your template, fly at the station of your choice, transform and bow their ship out of the sky, in less than a minute. Because you were going so fast, your asteroid was "destroyed" so you spawn in your battleship, and warp out of there.
Because it was a collision that was over in an instant, all that's left is wreckage, and no trace of whodunit.
Now, for countermeasures... we can disable collision in the server ini, but you'd still have your station flying away at 2000km per second...