I'd love to see:
Live support (Of course you can also do this with mods, but directly implemented in the game it works better. Also for example muscle reduction in space can be simulated.)
Simulated rockets in the background. E.g. for ion engines or automated shuttles (programmed with kOS or similar). In addition, it would no longer be necessary to slow down old rockets so far that they crash onto a planet, but it would be enough to slow them down until they enter the atmosphere.
Great physics and heat problems. On the one hand at re-entry (who is too fast is punished by the atmosphere), on the other hand in space by the sun (radiators and heat management).
Remote controlled units with time delay.
Stage recovery or even the possibility to refuel directly at Kerbin.
And of course: science!!! And all the other great things you can find in KSP. ;)
I believe in you, that you make the best game even better!
