Would you consider adding a calculation for chimera_mouse_sensitivity, for those using chimera?
Yaw is (or is effectively) 45/2618, and behaves as expected (4 is twice as fast as 2, etc., unlike retail halo).
If you're planning on testing it yourself, note that halo doesn't like scripted 360 spins, but it will work with smaller increments, like 2x180.
Edit: for sensitivities 6 and below, that is. Seems like it deviates sometime after that. https://github.com/Kavawuvi/Chimera#mouse-sensitivity