Personally I never change anything. Sure, it will give you a little more float but you can leave your bindings in the optimal spot to utilize the flex of the board most efficiently and use good riding technique to accomplish the same thing. It's all about front foot retraction way more than leaning back.
Quick thread hijack, seems topic appropriate-
Can you (or anyone else) explain what you mean by front foot retraction? I haven't had many powder days in my short time I've been riding (this is my 3rd season, ridden 45 days overall). I did get some knee deep pow first day this season and was struggling through my turns, fore & aft movements, and kept nose diving. I'm on a true twin cambered board with my stance centered. I was going to move my bindings back next pow day, but if there's a different method, I'm all ears.