See, I don't understand why anyone would want the paper coming from the back. You'd have to give the dang roll a reach-around to take care of yourself.
Plus, I think it's harder to rip off from the back also...you just end up making more paper come out as you pull down. If it's in front, it rips much easier.
I have to have the paper coming from the front. If it's not like that, I switch it immediately.