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[ichso]

@Sniper297
Well, I would doubt the Silent Hunter series ever having been a 'submarine simulator'. It has always been rather a wartime simulator as the whole, I think.
And a video game on top of that.
So they always tried to merge intuitive controls, an interesting campaign, historical accuracy, nice graphics and sound, submarine physics and mechanics into a single piece of software. All that within the time constraints that such a commercial products brings.
If they really would emphasis the diving mechanics as you want them to do, they would need to pull some focus from other aspects and the game would stagnate the according parts of it's development. But what they try to do (at least forced by the publisher) is to please a broader audience instead of only the realism freaks.
We are still about to see what they really did with the u-boad interior this time. But I guess that a lot of work must have went into getting the animations and behaviour of your ingame crew to make that a realistic (instead of irritating) experience. So, after all its still rather a video game than a extensive simulation (but still pretty deep for a video game nonetheless ).

You are looking for things that are usually included in mods or specifically dedicated open source projects. The latter ones are interesting because people there have no time limit for their works and can focus on a few points that don't have to appeal to a broad audience.