On the American TDC the spread dial is global, applying to all torpedoes equally. You have to set it to a different offset for each torpedo you fire, just as the real guys did. This helped enforce the proper spacing of shots by automatically taking up the necessary time interval.
In practice I seldom use the spread dial at all. I like to individually target each torpedo for a specific site on the target. Unfortunately, our American TDC is nerfed also. The real one let you calculate spreads of any percentage of the target length, making salvos much easier to distribute and ensuring that hits were spread out over the target's length. The devs should have consulted Nisgeis!
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