A great time saver for me would be to have a feature in Curves that when you decide you need more control points, Photoshop would interpolate new points between the ones already set by entering a value for total points desired, up to the current limit. It could operate channel by channel. As I get more skilled at color correction I find myself often drifting towards using more control points.
Having this feature should not cause any problems for those who don't need it.