Match Move, green screen and zoom.

I have started to use green screen and tracking points (from Match Move) for the background. I have no problems with tracking the two points.

It works fine as long as I tilt or pan with the camera but when I make a zoom in or out it is not conform scaling the background.

I'm assuming we are talking about using the Chroma Key feature in Motion 5?

How does it compare with some of the 3rd party Chroma Key plugins for the past?

It works fine, its very easy to get a accaptable result

However, unless I'm missing something, trying to use the better chroma key feature in Motion 5 (versus the lame chroma key feature in FCP X) ends up being a ridiculously impossible workflow when one is doing the vast majority of clip editing in FCP X.