Yes, it has been discussed before (it might seem odd if almost twenty years after the first SH and ten years after SHIII no one had ever thought of it). There are people who want something like that. I would just like to have a realistic sub sim that wasn't broken. I played LucasArts' Their Finest Hour back in the day, and thought the idea that I could single-handedly win the Battle of Britain for Germany to be more than a little silly.
A single submarine destroy an entire task force? Not likely. Destroy the main ship? It happened more than once, and didn't change anything.
Supposedly SH5 is smart enough that if you are successful the Allies will beef up defenses in that area. That's a good idea, but beyond that I don't know what's best, only what I like.
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