It would be great to have the following in the Add Location area for both the frontend and backend.
The ability to set the Location as your own current location - the little icon you normally get on maps.
The ability to zoom in/out using the mouse wheel - neither google maps or openstreetmaps gives this option in the Add Location screen.
Give an option to turn off address autocomplete in either frontend or backend. I find it really slow to resolve addresses. Sometimes easier to type the address in and press tab or enter for the map to update.