The blueprint suggests adding a new feature in Inkscape preferences and a shift in how the paths are edited. The idea is that we know exactly what values are in the SVG code
My suggestion is that this feature can be changed in preferences as a model for positioning, and you can choose from two options: Normal (as are the coordinates in SVG) and Cartesian (model currently used in Inkscape). Below is a preview of how the models.
Here is a problem in Inkscape: When resize an object, Inkscape considers half stroke on each side of the object, causing the object is actually a shifted a half stroke in X and Y and a edge smaller in height and width. My idea is not to consider the thickness of the edge when move, rotate and resize the object, displaying the correct values and helping in the editing of small objects.