[Idea of the original post: Adding a rod that only affects ships which passed the border into the circle around missions would be a good way to discourage kites. It would disappear after no more enemies are in the rod.
This could either be optional or added on higher difficulties.]
edit: @umbral citrus suggested that enemies warp away and you get no bounty when you run to far away. I think that instead of a damaging circle we could just have enemies warp when you leave the circle.
That would be more immersive and would still allow you to retreat a threat thats to great to deal with.
Also add a second pretty small ring around enemies: #1134199545417437184 message