Hello Kwinten Volckaert,
to develop a custom geomapping control and use the settings from Events module, you can use the following members of EventsManager class:
- GoogleMapsEnabled - returns whether user has enabled Google Maps through geomapping settings
- YahooMapsEnabled - returns whether user has enabled Yahoo Maps through geomapping settings
- LiveSearchMapsEnabled - returns whether user has enabled Live Search Maps through geomapping settings
The api itself and the control, unfortunately, you'll have to implement on your own.
As for the Google API key, I am not sure what's the domain or the name of your host. Personally, when developing I generate a key for "localhost" and it works, however it may be different for you. Let us know a bit more about the setting you have and we'll try to help.
I hope I was able to help you.
the Telerik team