Honestly, the only thing I want for KSP2 is advanced habitation. Like, having difficulties where it would be Kerbals don't need to consume and then Kerbals need certain amounts of food, water, oxygen, exercise or gravity (for health) and entertainment. Also, more advanced interiors and Kerbal mechanics, like Kerbals needing to work on multiple systems to sustain the ship. Of course, these options would hopefully be optional. Also hire me KSP team because I have a fantastic idea for later gameplay!