Multiple ship support in one build
As a simple rockets one player, it is always a struggle to fit 2 command pods in one build due to crashes involved. It would be nice to have easy two ship support for apollo, or stage reuse
I feel like there should be something like in KSP where you can have computer command modules as well. That way you could have multiple satellites or something like what SpaceX does (orbital booster goes back and lands while the second stages goes into LEO).