This would cause more BnZ than there already is. It would be more aggressive fighting. People are already timid as it is.
Perhaps more BNZ but if they stayed timid, they wouldn't get kills fast enough. It's not about the number of kills, it's how fast you can get them.
You could up into a furball and get 1 kill in under 12 minutes (5+ kills/hour) and that would get you a perk bonus.
You could also up a P-51, climb to 25k and BNZ timidly to avoid any chance of danger and end up with 2 kills in a 30 minute sortie, netting you no perk bonus.