I often find myself cloning curves and rotating them around to turn a single curve lathe into a 3 or 4 curve lathe with a similar shape.
I've added an "Auto Lathe" helper that adds and positions these curves for you so you can go from turn a lathe into a 2,3 or 4 curve version with a click.
This is helpful for limbs where you can get a general shape with 1 curve, then convert it to 4 curves to refine the shape of each side without worrying about lining up cloned curves.