Hold your horses!! I’ve been using Mac rhino for over a decade and always using a Magic Mouse. I have no problems at all.
In Rhino, go to preferences>view and adjust the zoom factor. Be careful because is very sensitive. Ive got mine at 1.009
Also, instead of using the scroll, I prefer to hold command and right mouse button and drag the mouse forward and backward. This will give you a smoother zooming experience, I use this method in windows too.
Do you mean right button? Do you know you can activate second click in macosx system preferences?
I also recommend selecting the object before zooming and run ZoomSelected. This will give you more control while orbiting and navigating around your object.