C340 - The rules that I mentioned were those ex. India. The Australia rules (and others) may very well be different.

Actually, I just booked one from India and they objected to the PIT-JFK-PHL sector as being backtracking even though it was only for a connection.

As for why they don't do the Oneworld RTW fare I don't know since BA,QF,CX all have quite a few flights to and via India. I'll have to ask the BA office this question.