A group of planets still orbiting their dead star.
Mods introducing new content into the game.
New places to build more factories.
Transportation of the player, be it vehicles or teleporters.
Augmented or new ways of transporting materials - belts, inserters, pipes!
New ways to deal with enemies, be it attack or defense.
Armors or armor equipment.
Changes to enemies or entirely new enemies to deal with.
Map generation and terrain modification.
New Ores and resources as well as machines.
Things related to oil and other fluids.
Related to roboports and logistic robots.
Furnaces, assembling machines, production chains.
Changes to power production and distribution.
I don't know whether you want to add restricts or not.Maybe there can have some techs and resources to unlock this mechanic?
I did notice that with the the FTL ships mod that use code from lex's aircraft as a base.
I'm putting it in the backlog, mainly because I wanted that specifically be a feature elsewhere.