I kind of dislike using the Australian FHR online booking system for two reasons.
1. It doesn't show all rooms available (and what the upgrade policy of the hotel is, which I always ask before booking a particular room to make sure they at least upgrade from that room)
2. It doesn't pull any special promo rates available like my example above. This probably will still be honoured at the hotel (I recall Island Shangri-La agent proactively telling me of a stay 4-pay 3 FHR promo when I checked in even though I wasn't even aware this promo was on) but there's no guarantee.
So yeah, while less convenient, I still like calling PTS to make FHR bookings.