Hey Paul,
Thanks for reaching out! You can change the Google Maps default zoom level on Settings-> General -> Map Settings.
Answering your second question, it is possible to use latitude and longitude coordinates to define a Venue location, but this feature is only available on Events Calendar Pro. You can check the “Using Coordinates” section of this article for further information.
If you want to know more about the PRO version of our plugin, click here
Let us known if you need anything else and have a great day! 🙂
Regards,
Patricia