I find that simply resting my index finger on the Magic Mouse can cause unwanted horizontal scrolling. Can BTT be used to disable single finger horizontal and possibly allocate this function to two finger horizontal scrolling?
This feature exists under Configuration > [top dropdown] Magic Mouse > [Left Sidebar] For All Apps > [right sidebar] disable vertical / horizontal scrolling options
However, the feature does not appear to function. If you find this is the case, please add your voice to this thread: Disable single finger scrolling not working