Rapid Fire Mod for Razor Wolverine Ultimate

Hey guys Hope you are all doing well and keeping safe. I just got my hands on the Razor Wolverine Ultimate controller and love it! i just have one question. how can i program one of the new buttons to be my fast fire button. so when i have a 1 shot gun i can rather program that button to be rapid fire and there is no need for me to keep tapping the shoot button. Thanks Kev