Or just a simple x,y cursor position reading (as used in many graphics programs) at the bottom of the screen perhaps?
That would be good but when you're in the event sheet setting the X, Y value you can't see your layout page (or even get to it). If the developers go to the trouble of making the layout available (via a popup or a button) might as well just click on the layout and record then transfer the co-ordinates back to the position dialog.