i read your previous post that for a one way stopover - it was $100, on a return you get one free stopover which i'm comfortable with.
not really fussed about the extra $100 for the stop, more interested in what's allowable.
and yes - q2 would be a stopover in each direction (but would it matter on SYD-JFK, i.e. where a leg has a "fuelstop", vs SIN-JFK where it is sold as one flight)