I suspect you're conflating two separate concepts here

1. Purchasing additional intra-continent segments on a xONEx (Oneworld Explorer ticket)
   On this ticket the number of free flight segments in each continent is limited to 4 (6 in Nth America)
   But you used to able to purchase up to two additional flight segments per continent
   This was removed from the fare rules a little time ago
   
2. Visit Passes
   These are still available - here's the link for the Visit Australia & New Zealand pass
   They are economy only, and the per segment fare is distance based
   Only available to non residents of Australia & New Zealand
   Must be purchased in conjunction with a OW ticket to/from Australia/New Zealand
   I don't know what they cost currently, but IIRC they weren't considered a great deal compared to QF discount economy fares

Edited to add:
I see you found the Visit pass info yourself, while I was slowing typing my response while having breakkie
And yes - I consider 35K AA miles for PER-AKL return in J to be one of the better award redemptions around (doing it myself next month)