Moon Gravity for space exploration

[Gurgeh]

That would require SE to do extra work / more than the bare minimum, so not gonna happen.

This. (Just did easter event.)
Besides... when was the last time you someone using 'jump' recently. People only tend to do that when they are having fun.
Also, how does this contribute to the optimal Savage meta?
Just look for the add-on. There will be one.