A certain lieutenant colonel is credited with the idea of dropping the short 25 pounders in the Dexter's Official History, which is repeated in Wartime. Unfortunately, I have my doubts about the lieutenant colonel being responsible for the idea, for it was practiced before he arrived in New Guinea. Dexter provides a footnote for a change, to an obscure book I was able to find in the library at ADFA. It doesn't back up the claim.
A better attribution might have been to Brigadier Sewell, who died from Scrub Typhus during the campaign. He arranged and supervised the tests although the original idea probably wasn't his either. His only mention in Dexter is in a footnote on page 279 listing the staff officers at New Guinea Force HQ. Would you believe that three brigadiers died in this campaign? By comparison, only two brigadier generals of the First AIF died in the whole of the Great War.