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Any flight bookable through the Qantas site is useable, sure, assuming you mean Jetstar Airways (Australia/NZ) and not the Asian affiliates. But you may find that Qantas codeshares on Jetstar are more expensive booked this way, even when you take into account the 20kg of baggage that's included.
Yes you can but there is booking fee which varies with type of booking - eg slightly more for international than domesticCan you call up Qantas and do a phone booking
You can buy International JQ starter fares with JQ flight numbers via QF website. Whether QF can sell all the JQ inventory and for the same price as JQ is another question.most long haul Jetstar flights are not bookable on thr Qantas website except with points
I've posted about this before here on AFFWhether QF can sell all the JQ inventory and for the same price as JQ is another question.