I am "only" a 29 1/2" draw length and don't have those gorilla length arms like BobW's, but I shoot split finger and don't have any finger pinch problems with either my 56" Morrison ILF or my 56" Shrew Classic Hunter. Tomorrow I will pick up a 54" Shrew Classic Hunter and will let you know how it does at my draw. From what I hear, it shouldn't be a problem either. David Knipes and Tim Fishell are right about the design of some of these bows. Most of them use a forward grip and a short riser section to get the best geometry and the most working length out of the limbs to accommodate long draws. And those long draws really add the speed. I bet BobW's arrows destroy targets quickly with the penetration he has reported!
Allan