Setting helo damage to 50% plus for retreat sounds good, 90% something important must have been hit by then?
Auto rotate is irelivant in game terms, its down so its still a kill. Could have a chance for crew survival but really little impact unless part of your core in a campaign.
When I have more time I will reply in more detail but changing units from one thing to another has the potential impact and an unknown number of scenarios. Removing and/or radically changing units is not a trivial exercise.
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"You are never to old to rock and roll if you are too young to die".--- What do you expect to be doing when you are 80?