There have actually been several mods released over the years to improve sinking and other behaviors for ships in SH3.
The two most recent and most extensive that come to mind are Thomsen's Ships and the TMT mods. Aside from correcting sinking, they also alter speed and maneuverability in an attempt to correct the cheetah-like acceleration and ability to nearly turn and stop on a dime.
Porting the SH4 mod may not be so simple, but you can use S3D to play with various parameters like buoyancy and flooding times to make your own mod. Best way to learn is by doing it yourself.
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Still sailing the high seas, hunting convoys with those who join me.
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