Interesting thread but: the replies concentrating on the 'simulated hunting' comment are, I believe, missing the key point (no pun intended). The 'simulated hunting' argument is irrelevant; the key issue is whether or not the scoring system should be changed and, as many comments above say, 'don't change what is not broken'.
The system proposed; one that introduces an element of gambling on your shot, is not new and has been used in many side shoot scenarios or what may be also called 'fun shoots' held at various times by various clubs. Yes, they are fun ... as are the variants e.g. score 1 for a prone shot knock down, score 2 for a kneeler knock down, score 3 for a stander knock down. In all cases score 0 for a plate. Yes ... good fun but not really adequate for competition use as too much depends on the tactics used by the shooter. The current HFT scoring format rewards the shooter for being a good shot with all shooters shooting the designated course as set out by the organisers. As it should be.
So ... nice thoughts, but the scoring idea is just for a fun tactical shoot not for the competitive HFT course.
Cheers, Phil