Yes the modification would void the warranty. I actually have and would still be riding their first set of pedals, called Magnums. They had the unlimited float you would appreciate. When they developed the Frog, I called up as an angry dealer and whined about the no float to the inside. Their response was they had had enough complaints (I read litigation) about the possibility of throwing a heel into the spokes, they decided to design that feature out of their new Frogs. So I ordered up 4 pairs of Magnums and some extra cleats. I was able to ride them for the next 10 years until last year when I had to finally pick a new system. That is why right now I am experimenting.