The ruler origin modification is really great. There's just a little bug with this feature. Place a object where you want on canvas. In transform panel look at the X and Y position of a node. Modify the ruler origin point as you want (to set a new one or reset to the default one). The X and Y position of selected objet isn't modified you have to deselect it and select it again to get the new position displayed.
Of course it's not really important