Hi Martin, so now that I look into it I remember now how it currently works - when you're resizing a line it looks through other curves and sees if that line is touching another curve endpoint at one side and if it is then it anchors the resize at that side.

If each end is touching another curve then it will anchor it at the one closest to the side where you clicked when selecting it.

If your line is just hanging out all by itself without touching any other curve endpoints, that's when it will get scaled from its midpoint instead.

- Michael