Spike what twaddle there is a very real difference between full coarse pitch and Zero effective pitch ( ~90degrees ) otherwise known as feather.
And a very real diffence in the pitch control selecting either,the detent or gate is there for a reason andthe engine is (must be ) shut down in feather, not so in full coarse pitch,in the early days of radials over oceans it was a common practice of the adventurous to extendrange using full coarse and careful throttle to avoid the potential overboost and engine destruction.