That's an interesting idea.. so the goal is for a script or plugin to be able to know the size and position of the FARR window... Normally you could get that with a windows call, but i guess if the FARR window disappears before the tool is launched it's too late..
My only concern with using the Farr variables is the idea that farr would have to save that file after every launch..
I could certainly make the size+position available as variables that can be passed to a launched app/script, or retrievable from a plugin call, that would be easy..