Have a possiblity to add notes/journal/logs of what we like to do in future for remembering self
There were games in the past, which allowed to make just personal notes typed in. I would find it helpful to do something similiar to KSP.
Have a button somewhere, which lead you to your log/journal, where you can write down, what you want, i.e. what you want to do next when playing the game again, or what happend and like to remember - whatever.
Maybe there would be some more interesting options to include other stuff (active crafts, planets, missions...) with a custom log/journal to produce a flightplan or whatever.