I would like to see civilian transit.
Cuz for some reason I don't believe I can get tourism income when I don't really see any way for civilians to travel to my planets... (unless its invisible and self-managed). I'm pretty sure they don't hop on down to GMC and buy an intersteller space faring vessel with 6 cupholders, plenty of trunk space and stow-and-go-seating so they can go on vacation. I would imagine that civilian transportation would work in a much similar fasion to how airports run today. With like super space liners that fly between planets transporting the civies. (Although I still don't know anyone willing to take a vacation that requires several weeks or even months to get there, then more time to get back)
So perhaps there could be a network of planets that civie ships go to and from, but because thats so many ships maybe be able to turn of being able to see them in options and just see the lines instead (or turn the lines off too). IDK how it would work but I would like to see it as a network with the lines forming triangles with no lines overlapping (people would switch flights at starports if the place they are going isn't just 1 planet away). And then even give it a manager so you can close certain planets off from the transit network (or open them), close your borders completely (allow no refugees to leave the empire (I'll explain my refugee idea later in the post)), allow no transit to certain civilizations (like ones your at war with),
This also creates a reasonable way for spies to infiltrate a planet, they can sneak on a civie ship. Since I never understood how spies can show up on a planet in less then a week and it takes my fastest ships a month or two to get there. They could sneak on board trade ships but I normally don't have a trade ship going to every single planet that isn't mine.
And since thats how civilians get to your vacation hotels, make transit the source of tourism income instead of your area of influence (which I never understood cuz I could put an influence starbase in the middle of empty space and get tourism income from it). So when you close a transit line (like during war) you would lose tourism income.
However I'm not sure how getting it in the game should go since it really shouldn't just appear at the begining of the game when your still colonizing but more like later when people get more civilized. maybe like a tech on the tech tree to research or a module you can put on ships then build the space-liners.
This also makes it possible to add a fun new feature I would also like to see, refugees. Lets say I'm the torians and I see the Iconians and Yor are going to war. Well I'm sure the civilians wouldn't want to sit around waiting to get invaded and (just like real life) they would flee (not an extremely large percentage of them though) their empires and stay in the safety of other places. (although the yor wouldn't, they're robots, maybe make that part of the super Isolationist ability). And I the torians would gain a population bonus from all the refugees.
I would also like to see more celestial objects floating around. Like for instance not all globules of matter condense into gigantic chunks of rock orbiting a big ball of hydrogen. I would like to see some that form into things like nebulas and gas giants. Or even comets and other flying things that roam across the map and can even smash into things like your ships or your planets or even stars, or even starbases, or even etc.
Maybe even put a countdown timer on some stars that predicts when they will go supernova since no star lasts forever. and when they do go out, the whole solar system gets destroyed and it forms into something like a dwarf star or a BLACK HOLE!!!!! (maybe put this in the galaxy setup screen as # of supernova stars option)
I would also like to see random black holes that pop up on the map accompanied by white holes that you can use to send ships from one end to the other . But not like those anomaly wormholes that you can only use once... make it a more stable black/white hole that stays for a long while. (and perhaps even have civie transit lines use the black/white holes )
OK I'm done with this super long post... wait! THERES MORE!!!
MINE FIELDS... please please please I would love to see this.
Stealth Ships... PLEASE PLEASE!
I would also like to see what that one guy was saying... post-invasion rebellions since theres no way you can kill all of them on the planet. And no occupation has ever ever ever worked in the history of Earth thanks to rebellions.
Ok now I'm done... WAIT THERES MORE... JK