Yes we do. Every manufacturer makes that info available. Edit: But we don’t need to know.
That’s a global adjustment done on the machine, we don’t need to know it.
Again, we don’t need to know. The machine is already configured to know this for each feeder/tray location.
They have, and it is well documented. The problem is with the library creators. Libraries are often created incorrectly and inconsistently. Very annoying!
Edit: Keep in mind, the centroid (.pos) file is not absolute, it is only relative to the PCB. It has no relation to the pick & place machine or the orientation of the component in the reel/tray. As long as it is correct and consistent, relative to your PCB the rest is easy.