The old torpedos didn't work like that. After leaving the tube they turned accordingly to the programmed gyro angle setting and went a straight line per default. Some circle runners where only malfunctions.
Later in the war you have access to FAT and LUT torpedos. They had a second gyro component to enable them running a ladder pattern inside the convoy perimeter.
Especially the LUT version will give you some of your desired functionality, as the second gyro angle is pretty flexible. You can set the first angle leaving the tube as usual, program a straight running distance and a second turn, to let the torpedo run its ladder pattern.
The LUT has a variable ladder turning angle. I once used it as a desperate measure to sink a destroyer right above my conning tower by running the pattern directly above my U-Boot.
The zommed out TDC screen will show the running path of the LUT. I'm sure you'll find out what settings do what by checking the graphics.
Most Kaleuns don't have much experience with the FAT and LUT, as they are sunk before the technology is available.
But check Subsim for FAT and LUT and you should find more information.
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