They do attack, but only with bombs.

I see a potential problem. The current AI always tries to score a direct hit. But the torpedo aircraft would need to drop the torpedo when it is still 400-500m away from you. The activation distance for a torpedo is, as you know, 300m. But a good mod could make all this possible, we will see...

If I see it right, there's two things that have to happen:
1) The plane has to drop the torpedo.

2) The T-V has to function as it does when fired.

I imagine adding a torpedo instead of bombs in the loadout would cause the plane to drop the torpedo correctly, aimpoint notwithstanding. The plane will aim for the best possibility of impact. If the targetted boat follows procedure and crash dives, the likelihood of actually getting hit by the falling torpedo is slim.

As for the torpedo functioning properly...
I've experienced misses which came back and hit me in the *ahem* screws. So it is possible for a live torp to continue seeking...the question becomes one of "will a dropped torpedo function as a live torpedo"? Which means we need to find the code that enables torpedoes when launched- the bubble trail, engine noise, and the logic that computes the "life" of the torpedo. If we can determine a "live" torpedo vs a "static" one, we should be able to figure out how to trigger the desired outcome.

Yes, but then we simply stop the engines and the Zaunkönig will never find us. :) Here´s another potential problem... When the torpedo bomber was called by a DD for air support it is almost 100% sure that the T-V sinks the DD and not us. A DD or any other ship is "always" louder than a sub.