Afaik the greatest tonnage sunk by Uboats in WWII came from attacks on independantly routed ships (IRS). Due to the intractability of the Admiralty and them not wanting to learn lessons from WWI this meant that the convoy system was not implemented as fully in early times as it was later.
It was even worse situation in WWI apparently.
Of course turning to the original question how to modify the game, sorry I am unable to help on that issue other than I would turn off the God's eye mode. Up to each how they want to play and modify the game, but for me IRS was part of the scenario and I search for them by use of the sound gear and regular dive/stop/listen routines. Usually pick up a contact before the map is updated with the contact. Of course what you then get is that you immediately know Allied/Axis/Neutral when in reality you would have to track down and identify. Guess its a realism factor.
Hence when I get to the Dead is Dead stage in this, my first career, I'll go back and wind up the realism factor which is around 50% ish, forget the exact figure.
My 2p's worth anyway fwiw.
Englebert
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SH5 U-35 2nd patrol
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