How do I turn off scrolling-based zooming?

You can turn off scrolling-based zooming by setting the manual zoom and pan to "no". Using the online customization tool, go to the "Settings" tab and change the "manual zoom and pan" to "no":

Or, in the mapdata.js file, locate the manual zoom setting and set it to "no":

If you want to keep the zooming buttons, you can disable the scrolling zoom by adding the following line to the mapdata.js file:

allow_scrolling='no'