When I did 50 aces in 3 days, I vowed to never attempt it again for my own sanity and the fact it was nearly impossible to repeat.
There comes a point where you consciously know the pressure is building up, I mean when you reach the 100 or so kills mark, this is the easy part, but then one mistake, one buff gunner, one random ack gun can kill it. I only felt comfortable with such pressures because I routinely picked up rack after rack and it was rare to see my plane without some rocks.
It then comes down to pure luck and having 200% SA watching every dot and paranoid map reading. If guys like Fester want this bizarre form of torture when they are flying then why not?
not hard to implement many games do it, even on WW2OL they have it.