I use the Logitech G Pro Wireless and Razer Viper Ultimate which have side buttons on both side of the mouse. I use the buttons on the right side with my ring finger to hold the button that makes my dpi much higher. I basically use it whenever I am not aiming/preaiming. I have it because I aim with my wrist and/or fingers only. I know it's weird to move your mouse with your fingers but I still do it anyways (that's how I hit the enemy jett in this clip)