[CharlesW]

> I will commonly wish there was a method to change a curve in a single drag in some particular situation…

If I understand what you want, you'd probably really dig the Curvature tool. https://www.youtube.com/watch?v=xzilL2zvldo

[crazygringo]

OMG yes. I had no idea that had been invented and added to Illustrator -- that's exactly what I've been looking for. Thank you so much!

[slimsag]

That is exactly the type of user interface I am advocating for, I love that.

Give me that + fast/efficient GPU-animated keyframes of those curves, and I'm 100% sold.