i would say yes also, but the stock fiddy wheelebase is so short that it makes the balance point very short as well. so, a little more length would prolly make the balance point a lilttle bigger which in turn should make it easier to wheelie. but then again, what the hell do i know?
My understanding is it would make it harder.. thats why drag bikes get extended swing arms.. keep the rear planted and the suspension travels rather than the front end rising..
the balance point would be moved not necessarily become bigger. just moving where the fulcrum is and changing where your weight is distributed assuming you keep your butt in the same seat position... not to mention having to go farther back to scrap a 12 unless you have an adjustable 12bar that will extend that far and not become so week it bends , or bends the frame.