"Calculate paths" for bones - arcs editable?

I only now discovered this useful feature, which draws animation arcs in 3D for the tip of a selected bone (Pose mode, select bone, W, Calculate Paths). IMHO they are easier on the eyes than Ghosting the bones. (How long has this been available?!)

Q:I’m probably dreaming, but is it possible to edit these arcs and have the bones’ rotations adjust accordingly? Would be great for tweaking animations. Thank you.

No, unfortunately you can’t edit them and they’ve been there since 2.40.