in the old days when i worked at JQI drw intl was all return flying, ie drw-dps-drw, drw-sin-drw,etc... highly unglamorous, all on the little A320, actually classified as short haul international!
That means no overnights and commuting would be tricky, mel-drw flights tend to be VERY busy and doing that after a bali return would not be nice...
think about it wisely, go to the RD and see what they offer, they are a good company but just be prepared!
good luck