One of the nice things with a OneWorld Explorer RTW ticket is that you get 4 segment’s and 2 stopover’s in your country of origin (but there are rules limiting Oz flight destinations). These 4 segments can be at the start or / and the end of the trip. As in the post above With a little planing (to comply with all the rules) you can get flights to somewhere in Oz that you would normally not go, like Broom, Alice, Darwin or some like place that can cost more than going overseas.

You must avoid returning to original departure point, as the RTW ticket is considered complete, once you return to the departure point. You have 12 months to complete the RTW. so you could go to Oz-USA-Eu-Oz and say 9 months later go to Broom for a few weeks as an example. With the RTW starting in SYD, your first OZ stopover would be MEL, (for ~9 months), the second say Broome for 2 weeks with the ticket ending in SYD. A cheap Red-e-deal MEL-SYD would get back home to Syd for the first stop over and another SYD-MEL to pick up the RTW ticket again