Another thing you could do if all the points need shifted is shift the userframe (if one is being used). Last year I setup a robot loading on and off of a turntable with a separate userframe per side so that long term if the guides get set different I can adjust the userframe for the entire side of the turntable vs retouching all of my points.
The other thing that has not been said is you could add a PR offset and simply adjust your offset every time an adjustment is needed.
Just like YakawFabb said adjusting points on the fly is not super safe if a mistake is made especially large mistakes. For instance forgetting or adding a "-" can make huge difference and is a very easy mistake to make...