MrNohbdy

Think it would be possible to get Ion Maiden on the calculator? From what I gather it uses a modified version of the Build engine that was used in classic titles like duke 3d, might be an easy way to bundle all of those games under one engine if it translates to older title calculations.

Important update!
I've added a "Config File 2" calculations to PUBG, and you can use this to calculate the MouseSensitivity value in the config file accurately. This way you can make a config file with accurate sensitivity that will be kept when you do any changes to the config in-game.
You can use it in one of two ways:
Just calculate the MouseSensitivity value and changed the config file accordingly, leaving out the LastConvertedMouseSensitivity value. For instance like this:

(MouseSensitiveName="Normal",MouseSensitivity=34.902415)

Since the LastConvertedMouseSensitivity is not present, the mouse sensitivity is effectively 0 now, and you will not move when moving the mouse. So enter the game and do a config change so the Apply button is clickable. You can do this by enabling Invert Mouse, click Apply, disable it and click Apply again (or opposite if you already have it enabled). The LastConvertedMouseSensitivity will then be calculated based on the MouseSensitivity value:

(MouseSensitiveName="Normal",MouseSensitivity=34.902416,LastConvertedMouseSensitivity=0.009969)
  Calculate both values using Config File 1 and Config File 2 calculations. Add both values you get to the config file like this:

(MouseSensitiveName="Normal",MouseSensitivity=34.902416,LastConvertedMouseSensitivity=0.009979)

You do not need to anything else in-game, the sensitivity will be correct the next time you start the game. And should you change something in the config in-game, the LastConvertedMouseSensitivity will be overwritten by an almost identical value. So why aren't the LastConvertedMouseSensitivity values identical?
The error is actually in the game, the calculations done here are the correct values. The game converts whole numbers correctly, but is off by a little bit (0.1-0.5%) on decimal numbers.
Also note that the game have a tendency to change the MouseSensitivity value a tiny bit when you start the game, something like 36.257845 will be changed into 36.257847. This is negligible though.