I have a feature in my application that triggers some change when crossing a threshold for scale. I wanted to add a hysteresis to this threshold so that it wasn't so sensitive to the zoom. The problem is that the amount that is zoomed each time the scroll wheel is moved is not the same. It doesn't even appear to be a uniform percentage of change that I can tell. So what I was wondering was if I can set the amount of change to scale that occurs on each scroll. Is this possible?