Personally, I'd like an autosave feature for the whole game. It should be achievement based, meaning that it doesn't just save at timed intervals, just when you actually DO
something, like terraforming a new planet, finding a rare item, making an ally, finding Earth or the Galactic Core, etc. It should also be able to be toggled off at will so that certain badges can be achieved without screwing up the rest of the game (Oh, the humanity!) and so the modders and testers don't do the same.
My 0.02$ worth,