Did you try reading the documentation? Don't just try to guess the name of a function. Perhaps this will help you:
options.disableMouse
options.disablePointer
options.disableTouch
By default iScroll listens to all pointer events and reacts to the
first one that occurs. It may seem a waste of resources but feature
detection has proven quite unreliable and this listen-to-all approach
is our safest bet for wide browser/device compatibility.
If you have an internal mechanism for device detection or you know in
advance where your script will run on, you may want to disable all
event sets you don't need (mouse, pointer or touch events).
IScroll isn't designed to prevent scrolling, so if that's what you're using it for, ditch it. Even if you still want IScroll for when scrolling is enabled, perhaps this could help you: How to disable scrolling temporarily?