Do you think there would be some room for some negotiating at interview to work a say 80% roster to just get a few more days off?
You can try. One of the blokes at my base joined on a 75% roster and he works just that (not sure what cavortingcheetah is really on about).
However, be warned. If you join on a 100% roster and then try to re-negociate, you could be waiting forever as a couple of ex BA/CX guys have found out recently. They left.