A useful table showing the total lack of consensus on the MMP recommendations.
I’d be careful concluding that retaining the status quo is beneficial to National. Neither United Future or ACT got any List MPs via the one seat threshold in 2011, and frankly I am dubious they would so in 2014.
If anything the party most likely to bring in a List MP might be Mana.
Also lowering the threshold from 5% to 4% is most likely to benefit the Conservative Party, which is a potential coalition partner for National. So again retaining the status quo is not really of much benefit to them – in fact could disadvantage them.