One way you could have players affect the game indirectly is when Serco economy rises to much over Itani. Itani will lanch an assault(NPC) and vice versa. As part of this assault Itani will try to hinder Serco's supply line by attacking ships that try to improve Serco's economy. Also temporary mission will be offered to try to tip the scale. It Serco economy is is to much over Itani. All Serco memebers shopping in the Serco region of space will get an appriote discount(depend on how much of a lead there economy has in comparison to Itani's). Also the price of Itani items in their region of space would rise. Neutral would not be affected in any way so the other territories might hire them to balance the economy as well.