Is there an option for realistic sink speeds?

[thewumpus]

I remember this was an option with SHIII, but can't seem to find it in SHIV. Default sink speeds seem way too fast to be accurate. Also watching planes slide off the decks into the water is humorous..seems more like freefall through air speed. Probably can be fixed in a mod, but just wondering if my noob self just isn't looking for the setting in the right place.