I've updated it now, and also re-ordered the calculation so the Horizontal Speed is calculated first. This will increase the range and avoid potential errors.
Vertical Speed should be set to the same as Horizontal if you want them 1:1.
1.0 got released. Seems like they 10x'd the sensitivity range from 1-100 to 1-1000 so you can be more precise.
Also, is vertical speed really supposed to be 100?