Worked at PX for a long time and it was a great time!
Seniority prevailed but the Nationals had the ability to jump frog when their experience levels were sufficient. I believe that has changed somewhat to a more staight line list.
In any case a great bunch of guys (of which I can guarantee Night Beetle is not one of) and I am sure one of the more current guys will give you the current info that you seek.
Have a look at the resigination rate and have a look at the return rate ( three times for some) and it will help explain why it is a sought after opportunity.
The only beetles there are in Goroka and they close the aerodrome to facilitate the Beetle hunting activites of the locals.
The Notam reads as such!
PPRuNe could do with such a policy.