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One more thing, and I think that if quality assurance is about the quality of the module and thus, increasing near-universal usability, then this qualifies:
Module Documentation.
I cannot tell you how often I have found myself at loggerheads with a module, because while the functionality is in there, undoubtedly, I could not seem to pry it out.
One thing that we can advocate for is documentation aimed at admins, to help them get that module up and running in a reasonable time frame. I mean doing what it is purported to do, not just installed and sitting there, looking promising.
That would be a real quality boost.
Also, and this could be a toughie: A standard on screen and operational metaphors. Cut down on the "Tower of Babel" factor.
Of course, I do understand the native language pitfalls in all of this.