I asked Stefan about it once.
TÎffãñ¥_Mãñãgêr: is it possible for a nat to change his own kills/deaths , like make an npc to do it?
dnd: yes
dnd: its possible now
TÎffãñ¥_Mãñãgêr: i have two reports one of my nats got over 1000 kills in 15 minutes
dnd: should i add some flag to enable/disable this new feature?
dnd: you can switch back his kills back 0 next time he is logging it

He told me how, so i did.