What I don't understand is if they wanted ranked balloting that would have given them majorities almost in perpetuity. Maybe I'm wondering if the Supreme Court would say that if something like that were passed that there would have to be a referendum on the matter.
Ha, I went to reply and almost edited your post - not used to having so many buttons.
Anyway, I don't see how that would have been the case, since the things not mentioned in the constitution are under parliamentary supremacy.