Two quick thoughts:
Is it possible to not require the five digit code if you are logged in? That way logged in GEH members wouldn't even know that the five digit requirement exists.
If not, can you force the field to be active? By that, I mean have the curser flashing in the field so that I can just start typing, and not need to mouseclick before my numbers will be accepted.
(boy, isn't it easy to fix things when you don't have a clue as to how they are built?)