It constantly amazes me that large warbirds that are operated nowadays ,do not fit a `feather prop`system,as any failure generally leads to the prop going into a `fine-pitch` situation,leading to excessive `flat-plate`drag,and upsetting the aerodynamics .I know single -engined aircraft with `Constant-speed` props ,in event of losing oil pressure should have the prop lever pulled back to as `coarse` as possible,for as long as possible,as it will improve your glide angle and reduce the rate of descent,but it seems it doesn`t necessarily appear in POHs,or people are not aware of it..I know people will say it wasn`t designed in warbirds originally and would require a modification to a seperate oil tank,and pumps,but then most BIG engines are mainly ex-civilian off airliners,so should be capable of retro-fit....
It was always in the forefront of my mind ,watching the oil pressure gauge in a big s/e TBM during air displays.....