It would also be nice if core worlds had better preparations to defend against common threats. They should have stockpiles to prevent sudden death by spaceport knockout.
If a bounty expires and player has not done anything, they should send an expedition to kill it. They send so many at your colony and not enough at their other enemies, whoever they are.
I would also be nice if we could stabilize non hostile faction colonies that fall below 2 stability and to prevent it from being abuse-able it could give zilch rewards.
Preserving long-term profits is reward enough. The main reason to stabilize them and not take their planet is because you want their money through commerce with your colonies.