Not sure if this would be considered a feature request, rather than an issue:
In the "Add a Mouse Action" dialog, under the "Click / Scroll" tab, in the "Scroll with the Mouse" section, the NumericUpDown controls default to a value of zero.
I feel it makes sense to have them start at 1 instead, and as they don't go negative, I would even argue 0 could be dropped altogether(unless there is a technical reason to scroll the mousewheel zero times).