Hi!
The main feature of Wp Store Locator is precisely to be able to define your data points in the map, include as many additional fields as you possibly want, and totally customize the map experience for your visitors.
With Wp Store Locator you can also modify the appearance of the search results, markers in the map, individual stores templates, and many other things that Google Maps simply don’t offer.
And, for that, you need to maintain your own stores database, which is done via the standard WordPress interface.
I hope that clarifies things.