There is a ? mark next to the mods in the the software on the computer. This is what it says
What is Auto Sprint? The Auto Sprint mod is designed for Call of Duty games. Are you tired of constantly mashing the left thumbstick to make your soldier sprint? Now you don't have to!
To enable auto spring, hold down the mod switch and hold the throw lethal button, then tap your sprint button. Player 3 LED will twinkle and then stay lit to let you know that this special feature has been activated.
When Auto Sprint is enabled, all you have to do to make your soldier sprint is flick your scope button. Now you'll never have to press your left thumbstick again.