While making the photoshoots I always try to position all the shooting points in one straight line and the bends in 90 degrees. This makes creating the navigation in P2VR much easier. I always use maps, never the satellite view.
To adjust all the nodes in a straight line will be much easier if the map-image can be turned so that the view becomes precise horizontal and/or vertical. Or a grid overlay that can be adjusted by turning it and a changable size would also be a good solution... Just my two cents.