I am a man of many ideas but my modding skills are so poor that I literally wouldn't even know what I was looking at if I saw any coding much less the fact that I wouldn't even know how to start modding. I am programmer illiterate on my BEST day but some of you in our Steam community have made some wonderful mods, so here is my pitch :)

Food Synthesizers, that way all the people can be Fed by the machines but you no longer need to produce food and can make more room for other things.

Robots can be upgraded to carry more items at once.

Robots can be upgraded to self-repair, thus you don't have to worry about replacing them. Tech upgrade.

Citizens can store firearms on their person instead of storage locker, same with the police. That way you will produce firearms for all the citizens and police in the colony and you don't even have to make room for their storage lockers.

REM Pods, sleeping structures that enable citizens, even in groups to get a goodnight's sleep within just three hours.

Matrix Machine, an entertainment machine that is far superior to TV's and other things you use to entertain your people.

Oxygen should be able to be produced in any module, dome, room, etc, albeit with another technology.

Fuelcells should produce monumental amounts of water but also require more power, allowing the colony to save room, essentially like building a wonder, each fuel cell creating a plethora of water and sucking up tons of power.

Fusion reactor, one of the monolithic wonders, it costs a lot of money, labour, resources and time to build but provides 1 million power. Most expensive structure in game.

Forcefield tech, the most expensive upgrade, makes it so that meteors no longer damage the structure. Needless to say it won't work without power and lots of it.