I don't see how changing who gets the credit for ack kills is going to stop either:
a) people running away to their ack
b) people following them into the ack and dying
I mean, I get it, it's annoying. I chase people in sometimes (usually when the ack-runner is the only enemy around) and I get pissed off if I die in the ack. I just don't see why it matters where the kill is credited. It's annoying whoever gets the kill.