If this is added, I wish for manned ack to have a little red icon near it to indicate when it is manned. Reason being - When deacking a field you have not much to worry about until you start "hearing" the ack. That's when you get alert for the manned ack. If this conventional method of looking out is masked by auto ack sounds, the icon would be a nice addition. Kind of a separate wish I guess.
