At the moment, there is only a grid for objects to place, but none for paths and fences. So it would be nice, if you can toggle a global grid, that you can see over the whole map, to snap both of these things and get the most perfection.
Also currently, Object you want to place are sometimes offset or have a completely different grid too and its getting confusing most of the times, so I think a global grid would help there as well.