Greybeard,
Interesting your mention of a 2005 directive …. re use of more than 'idle reverse'
The PX guy's give the reversers a good work out at Madang when the runway is wet.
Recent volcanic activity which closed Hoskins to all traffic due volcanic ash, of course PX did not comply, there is plenty of video footage of Fokkers landing in the ash with hefty amounts of reverse. I think the Tay is very mature and almost indestructible?