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Online MASA's went the way of the dodo with the implementation of the new you beaut one size fits all online booking engine.
Previously, the system had at least five separate engines- revenue one-way and return, revenue multi-segment, classic award, classic multi segment and any-seat.
I believe firmly that the facet MASA's could be used to garner status credit relatively cheaply was a lucky accident of the "law of unintended consequences" when they decide to encourage use of any-seat by allowing points/SC' earning.
Anyway, back in 2012 or earlier Qantas decided to have the one single basic booking engines and redefine what they meant by an ASA by revising points plus pay and calling it "any seat".
That is the demise of the online mASA would have happened in any case.