I'd love to have the ability to link the position / rotation of one object to the other. Right now it doesn't seem to be possible to do this unless you create a copy of the desired source, cancel either pos/rot manually, *then* link.

For example, if I want to do perspective fakery tricks, I have to copy my camera first, cancel its rotation, THEN link my scenery to that copy of the camera. And if I change anything about the position of the original path, I have to redo these steps again.