I vote to leave it as it is. If I die in the ack and somebody gets a "free" kill, he was probably at least trying to defend the field, so give him a freebee. If I shoot the tail off somebody over my field, and he flutters down into the ack, I deserve the kill. Also, there were a lot of "ack suicides" in WB, just to deny kills to field defenders when they got the advantage.
Or....change it. I really don't care.