I think there should be something where you can be in first person mode with Kerbals and be able to move around the cabin, like if you were in a space station.
and with that, there should come some better viewing cupolas, or a glass structural fuselage so that Kerbals can see what's outside. With first person and a view of the inside of the cabin, you could also have an interesting EVA, maybe depressurization and the opening of the hatch to the vacuum of space, or to the planet you're on. Could also be for transferring Kerbals from different ships