Cant say i agree with you...
I've wall jumped with my gnome always (been to hyjal thousand of times too), and i must say that i think that gnomes are the easiest race to walljump with, after what I've experienced. I guess its because I've gotten used to it..
I think you learn to wall jump with the race you start with... And then if you try some other races which jump different, then you cant jump with those...
(I cant wall jump with any other race than gnomes >_<)