Weird Picking Technique

Hi guys. Here's my problem....I have been playing guitar for about seven years now and have never been able to get a real answer to this question: I use three fingers to hold the pick (jazz III) thumb middle and index and what I want to know is.....is it possible to shred this way or should I switch to using the more traditional thumb + index technique?????? Is there anyone out there who has had this problem before????? Thanks.