This might not be really user friendly to be honest. One quite often has something to dimension where both the x and y dimension is >0 and for that usecase one really needs to be able to fix it to horizontal or vertical.
Just take this dimensioned footprint (form one of my pull request reviews) as an example of what i wish would be possible from within kicad (or alternatively give us a dxf export of footprints where pads are made into outlines and graphical lines as lines then we don’t need all features within kicad and can use librecad more easily.
