One thing I think would help spruce up the game a bit is the inclusion of Privateers and Mercenaries.
Privateers: Take a fleet and convert it to a Privateer fleet. To all other empires it is a Pirate fleet and can ignore borders and attack anyone. When they destroy stations and fleets the home empire gets resources and maybe even occasionally tech points.
Mercenaries: Take a fleet and offer them for rent to other species. While rented a portion of their fee is sent back to the home empire.
Privateers: Take a fleet and convert it to a Privateer fleet. To all other empires it is a Pirate fleet and can ignore borders and attack anyone. When they destroy stations and fleets the home empire gets resources and maybe even occasionally tech points.
Mercenaries: Take a fleet and offer them for rent to other species. While rented a portion of their fee is sent back to the home empire.