I have multiple healed broken bones in my hands. I use a "CronusMax Plus" so that I can program the controller input to this exact thing. I also have it set up to only require a partial trigger pull since I cant pull my finger back far enough to fire normally. They have an AWESOME support community and if you were to purchase one and place a request for a custom script i'm certain someone will make one for you. Some of the premade scripts already have auto sprint enabled.