Mouse Sensitivity is broken (Insanely Too High!)

Sensitivity of 0 is ridiculously high. I don't understand why the sensitivity isn't a multiplicative value like every other competently made game. What's with this arbitrary nonsense? I play with a DPI of 1750 and I should be able to play with a sensitivity that nets 22.22 cm (or 8 3/4 inches) to make a 360 degree rotation. That isn't even an option. Not even when I crank my sensitivity to 800 DPI (which severely compromises usability of the mouse cursor). With 0 I'm at best getting 13 cm (or  about 5 inches). Way too fast! 0 should be 0!!! Nothing! No movement!

 

This issue has been going on for at least around a year, and is a big hindrance to playability. How this has been left unfixed for so long is beyond me.