Was looking around in my $42-1227747-v4.3.xdf today and noticed something I haven't seen before.. "ALDL/Closed Loop Spark"

The note says that this is spark added when in ALDL mode, which I get, I think.... But the parameter comment also says "Zero this or else you will be chasing knock issues for a LONG time"......

So what? Just zero it out and leave it???? Why is it even there?