Manual dive planes, ballast tanks, etc. would be nice additions, if someone took the time to figure out how to implement them. But, for the reasons mentioned by Volodya and others, I'm not sure I would use them very much beyond the initial "wow" factor.
One thing that would be highly useful, though, is more realistic AI use of the dive planes to control depth. When submerging, the boat frequently dives at a steep angle, then blows ballast about ten meters above the desired depth to stop the descent. I'm not sure whether DDs can hear this, but I always cringe when the LI blows the tanks, to make no mention of the waste of compressed air.
As far as I know, it was standard procedure to use the dive planes to provide "lift," much like the wings of an aircraft, instead of haphazardly blowing ballast every time a change in depth was requested.
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