"MT D" yr advice is spot on
"eovictim" as you say ATPL is mandatory in the SE section (all bases) You don't "need' it but it's 'required'.
ANY pilot having the desired numbers (hrs) needs to be switched on to do well in an RFDS interview. The guys conducting those interviews are very switched on themselves. As that saying goes.....'chance favors the prepared mind".........don't turn up at an interview (if yr lucky enough to get asked to do so) without having a good knowledge of IFR procedures especially night Ops. & all the associated "why not's" that go with night Ops. Know yr WX Alt req's too. Those with good scans will do well in the Sim, free advice DON'T fixate on the one instrument/dimension under abnormal conditions, (easily done under stress) quickest way to stall the damn beast even though you nailed the Hdg
Good luck to anyone that gets a gig with the RFDS it ought to be mandatory to do a stint there prior to the big boys
Wmk2