I'm back with my stupied ideas:)
1.System blockade, system fleet's can blockade a system so that only people with a certain power over the fleet (fleet+station power+(amount of blockade upgrades on station/player*?)) can enter.
Requirments: Reaserch, station with upgrades, system fleet, owner must be in system, not all systems can be blockaded.
2.More secret asteriod base functions.
Recruit worker's, converts credits into workers straight away.
Recruit marines, resupplys ships in fleet with marines from credits produced.
Post ships to the base, doesn't show up ships on your scan but when they attack kaboom
.