ARK: PDC only colony pods. Stores several hundred thousand colonists without any sort of thermal or EM signature.
Underground Hanger: Very large but only on PDCs.
Necropolis: Clones or seeds a limited population in case of emergencies using stored embryos.
Cloning Centre: Clones a population, to increase population growth based on the number of buildings and wealth available(as opposed to natural growth, which is affected by radiation, colony rating, current population, etc)
PDC Cloak: To increase the cloaking size, but only on PDCs.
Colony Pod: Can build infrastructure like a large civilian population, when above a planet and with access to duranium.
Production pod: Ship or PDC based that produces maintenance supplies with proper resources.
Active ECM: Produces EM but makes the ship harder to hit with active weapons when activated.
-Have missiles intercepting targets moving perpendicular to their course should follow the hypotenuse of their expected course, not curve to follow their current position.
-Allow colonists in stasis to be transferred from one ship to another. I'm not actually sure if this is already in the game.
-Allow us to force an NPR to surrender, capitulate, sign an armistice, etc, through SM.
-Allow an NPR to be hostile militarily and militarily, but choose not to engage in hostile actions.
-The ability to force civilians to move in convoys in hostile systems.
-Prison colonies: currently I played a game where I captured the enemy homeworld (what appears to be their only world) when another NPR destroyed their last population centre. Now the only remaining population for that race is the 10,000 POWs I have laying around.
-Prison Ships: To transport POWs from one world to another, or to a permanent prison station. Perhaps a brig component?
-Ability to rename populations in the population and production screen. When you do a multi faction start and conquer another player, they both say "Earth - Human" for the population.
-Allow us to input data manually into intelligence: weapon type, damage, rate of fire, range, number, missile size, magazine size estimate, etc.
-Update the strategic intelligence window to show data such as know population centres, manufacturing centres, leaders, mining colonies, civilian companies, etc.
-Have signal interception pick up basic intelligence about a race when close to high population worlds
-Have infrastructure be upgradable to Underground infrastructure, somewhat like mines and automated mines are right now.
-Allow terraformers to clean up atmospheric dust
-Have terraformers produce tonnes of gases instead of percentage of gases (pressure scales with planet size?)
-Have gas pressure dependent upon diametre of planet.
-Mission Packages: Have a ships ordinance/strike group be separated into mission packages you can customize. Have mission packages be on a ship by ship basis, with one being chosen as the default mission package.
-Have a 'variant' option when designing a ship, which will warn you when activated when you go over the retrofit limit; comparing the current design to another of your choosing.
-Have a retrofit tech to increase the BP limit of retrofits.
-Have components which are of a much smaller percentage of the ships total tonnage cost less to retrofit than a large component.