Propably you have a such high sensitivity that you can't aim very well while zooming. "Sharpshooter's friend" allows you to have a lower sensitivity while pressing a defined key. This is useful for fragging campers, who don't move or who less move.
// Define here your key to sharpshoot bindkey = "LSHIFT"; bind $bindkey [ // Let's go oldsens = $sensitivity; sensitivity 2.0; onrelease [ // If the player releases the button sensitivity $oldsens; ]; ];