Hate not being able to use multiple separate spline objects in NURBS and other generators? OneSpline is a generator object that lets you do just that. No need to child to a Null object. Simply child the splines to the OneSpline object. Now has Spline options in Attributes Manager. Windows 32/64-bit and MacOS 32/64-bit plugins included.
Cinema 4D version 9.1 or later, Windows/MacOS, 32/64-bit