I was just thinking about this the other day, and I am glad that I found that it was already suggested. It would be really helpful to have lifetime stats for ships in order to see how effective they are, and to spot in trouble areas in fleet composition. When I am in a battle, I am paying attention to my flagship, so I don't necessarily see what the rest of my fleet is doing. Also, there could be a certain nostalgia factor in seeing the stats for that ship you've kept around since the beginning of the game. (In my case it was a Hound, the little guy had the heart of a champion).
Having more detailed stats in the after action report, and a lifetime stats page for each ship would be really nice.