‘Gifted’ ? As I understand it simply being the incumbent Australian operator doesn’t entitle Qantas to all and any future slots to any destination. What ‘deal’ regarding Narita Ops to obtain Haneda slots do you speak of? Of course Japan doesn’t care about Competition between Aus Airlines, that’s why we have the IASC. From the IASC website it looks as though they seek as many applications for the slots as possible as part of their charter is to encourage competition.
AFAIK technically there is an Open skies agreement between Japan and Australia, the constraint being airport slots.