Trim overlapping for curve surfaces

Some built-in support for trimming away parts of NURBS curve surfaces that overlap. E.g. Trimming away the part of an aircraft wing that extends into the body of the aircraft.

Even a basic boolean operation that allows the user to cut away the overlapping parts would be nice. I'm guessing this would yield a tidier result than first having to convert it to a mesh, boolean, and then clean up.