The main problem with PNG is the guy being jumped my multiple cons has no way of knowing if one of them is PNG. PNG wasn't a good way to remove a guy from the fight, which is something our current KS setup does extremely well. Also, a slip typing while taking off could easily net you 2 friendly kills, and you could easily wing up PNG that way, which would be unfair for inadvertent kills.
KS for everyone but me would suit me just fine.