I dont know how much influence you got in spawning NPCs but maybe letting some little spontaneous PvE events happen, eG a wolfpack of Rogue Wolfhounds haunting the Pittsburgh Debris field attacking a DSE transport convoy. Both lawful and unlawful players could get involved and it would fit immersively. The npcs should be considered a big challenge in strenght... well atleast stronger than your usual lv 19 npcs and could maybe have some special loot... like regular codeguns, thrusters and/or some commodities... or maybe just a bounty payout handled by plugin or event overseer. Little things to go explore, maybe getting hinted where something unusually is reported but still going with the flow of immersion.