A more restricted free cam has been one of my pet peeves for years now.
ONLY.. i wanted it a bit more restrcted then what you suggest. I wanted it so that you could not use the camera to see what was on the surface while submerged - in other words, restrict its height as well, and confine it to the area near the player sub.
I spent alot of time on this, and nearly suceeded. In the end, i threw in the towel. My conclusion was that the camera.dat file, seems merely to define parameters, but certain aspects of cameras behavior, is defined elsewhere. I could be mistaken in that, but i tried for days and the results were marginal.
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