I'll make this short, as it's my first writing on this site, but I believe KSP 2 would be much more interesting if the outer planets were to be officially added or at least made into a mod, effectively doubling the size of the Kerbol system. I can even see how to lead up to it. At one point, Eeloo completely disappears from its orbit, and then further investigation reveals it has captured around a new gas giant(or not new, when you think about it). I just think making the outer planets canon and giving them and their moons touch ups would spice things up a bit. At the same time, the developers have been hinting towards a new mysterious planet beyond Eeloo's orbit.