Looking for a link or an official explanation of the advantages and disadvantages of the following
1. Manually selecting AA target.
2. Manually selecting Secondary target.
Please assume that I am asking the benefits of this based on NO additional Commander perks. ie. I understand that manual secondaries won't fire without a target selected if you have the skill "Manual Fire Control for Secondary Armament" and I understand you don't get the bonus for the skill "Manual Fire Control for AA Armament" except on the selected target.