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This is probably better suited for the 'Suggestions' forum, and I don't even know that MP is on the roadmap for Rimworld at all, but I would be very much in support of your first idea.

Many singleplayer games can be better with multiplayer/co-op support

The second I could see being a little more problematic, you'd need to perhaps split 'ownership' of the population with each player's population prioritising first their own player's priorities and plans before assisting the other players.

Imagine that you play in something with friend at your home. But you only have 1 keyboard and mouse, so you can't do two or more things at the same time. So I think that it better for co-op to have different colonies for players like in MP or to control the same colony. So when you're fighting with some enemies and having troubles, your friend can help like if he was on your computer, but connected with LAN/Internet. But population separating is also a good idea.

Some ideas about multiplayer and co-op in RimWorld:
1) [MP/CO-OP] What if make 1 world (planet), but players are playing in different colonies and they can trade/support/help/attack each other? Like a server hosting world/planet and players are just controlling they're own colony.
2) [CO-OP] Some players just controlling the same colony, like if you have some friends who help you control the colony (example: you're fighting with mechanoids and your friend at the same time is making a new room in a cave-home). It is useful to distribute tasks.

Tell me if these ideas are good. And tell me about some mistakes in these thoughts.

P.S. Sorry for bad English.