This looks like a great idea. It would provide some consequences to the horror which some players/AIs will spread. This could perfectly be part of an update adding civilian transports of pops, leaders, and perhaps embassies (rather than insta-teleport), perhaps organized in flows like the EUIV trade system. The danger of civilian ships being ambushed along these routes (a common trope in scifi) would be awesome as well, adding possibilities for assassination or enslavement. As someone said, it would go great together with a space nomad DLC, which is already in demand. If they want to go far, different pops could have different reactions (individualist refugees perhaps attempt to spread out, while collectivists stay together or make nomad fleets, for instance).