1. The Google Map Editor includes
points addition by GPS coordinates, and it can also
pinpoint locations by address/ZIP code. You may let us know if you have any specific GPS features you need, and the editor does not do with the same search behavior in vanilla version of Google Maps with suggestions or corrections made.
2. We have
corporate license for up to 10 users using the editor, and our current version does not have usage restrictions to the functions in the editor. Customization is required if you need more users and they have access restrictions. You may let us know your scenario and we can check if a custom mapping system can be made for you.