If I had just one thing, and one thing only, to mod, I'd ask for... a bearing indicator in the periscope view. Something to indicate the direction I'm looking, accurately. I've managed some nice manual setup sinkings using the field of view indicator in the compass, but each one has been a nail biting experience all the way, not because my calculations were off, but because I can't be absolutely sure of the ship bearing in the periscope.
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