This is way late but thought I would respond anyway.
Yes, you are right: being capable of just editing the quiz is important, and all is fine as long as the versioning guts of the system do not show.
However, the instant you add an UI for the user to actually handle the versions, you are adding modality, with things like making an old version the current one and making sure users know if they are viewing an old version, and not the current one, and seeing the differences between different versions. These are challenging do design into the UI, and more so to the already crowded Quiz UI - and certainly not something I would ever do without some considerable usability testing, to say the least.
Mediawiki and even Wordpress do this pretty horribly, in my subjective opinion. Google Docs' implementation is more limited and in that also adds restrictions that seem to make it clearer (again, in my very subjective view). Though you can cope with it after practice, it seems to me pretty easy to get lost. Of course the upside is that even if you do get horribly lost, the whole system is built so that you cannot do anything that someone who does understand the system could not undo.
I just tried to write a roadmap for the Moodle quiz
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