This is just a short list of ideas that I think would be cool to see in the game. Feel free to give feedback or your on ideas.
Spies
Cost a constant flow of money for each one hired
Gives full field of view of planet
Can cause revolts/riots, which lowers the population of the planet
Can be placed on friendly planets to defend (kill) vs Enemy Spies
Sabotage: can reset the current tech being researched. 1 Spy can sab tech one 4 spies can sab tech 4
Star gates
Allow near instant travel between 2 planets.
4 levels of tech: 1st is 3 jumps 2nd 4 jumps 3rd 5 jumps 6 across a solar system.
Cost a huge amount of resources and has long recharge time
Must be built on both sides
Can be destroyed fairly easily
Cost related to number of ships going through
Space Mines
Once enemy cruiser or capital ship enters a certain radius it moves towards it and explodes.
Can do damage or EMP
Built in same manner as a building
Jammer Beacon
Fairly large radius
Keeps Fighters/bombers and Frigs from communicating (AI takes over ships, player can't select them)
Black Hole Generator
Pulls fighters/Bombers towards the generator causing them to explode
Small radius
Once the generator takes enough damage it also explodes