1. Go to the Shadow Warrior Classic Redux installation folder and open the folder "gameroot"
2. Open sw-redux.cfg with a text editor and find the lines MouseScaleX and MouseScaleY and chage the numbers next to the text to the following.
3. MouseScaleX = 3 MouseScaleY = 2
MouseScaleX = 3
MouseScaleY = 2
4. Save and close the file
Settings do not persist after exiting the game.