that goes in input.js file where the google map options are, find
// vars
var args = {
zoom : parseInt(this.o.zoom),
center : new google.maps.LatLng(this.o.lat, this.o.lng),
mapTypeId : google.maps.MapTypeId.ROADMAP
};
and add it there like this:
// vars
var args = {
zoom : parseInt(this.o.zoom),
center : new google.maps.LatLng(this.o.lat, this.o.lng),
mapTypeId : google.maps.MapTypeId.ROADMAP,
scrollwheel : false
};