In the in-game settings, the "Aiming Deadzone" slider does not change aiming deadzone. Let's say if you set it to halfway, click away from the options that has aiming deadzone or just go back in game (it doesn't work), then go back to the aiming deadzone slider, it will be reset to 0. But in the config file if you change "floatingzonearea=0" to a value, aiming deadzone will be working in-game. The "Aiming Deadzone" slider in-game will still be at 0, and trying to use the slider will not have any effect in-game still.