Here you go: http://i.imgur.com/WMwfPNa.png
The mesh I’m using is on the left, it’s a flat quad and the origin of it is in the middle of the mesh.
If I turn off “scale to width” the offset works as I’d expect it to work. Than it isn’t affected by the control point width settings. It also could be that I’ve misunderstood how this is supposed to work.