It would be nice to have the option of curving the fuselages and not just displacing the two ends.
This can make replicating fuel ducts, tubes for monorails (and hyperloops), artificial gravity rings and much more things possible.
I would love to have something like a bezier curve in both ends, but if that's too complicated a curvature parameter may work, so the curvature will always be in the same axis and then we can rotate the part to fit it where we want.
Extreme curvatures can help making toroids, or at least the use of 3 90° curved fuselages.
Yesss! I need it too!