Torpedoes
Yes, in the game, all the torpedoes hav a magnetic detonation setting. So yes, you can switch to magnetic det, set the depth and return to the periscope to fire on those settings.
Convoys
Everyone has their favourite tactic, the one you quoted works well, have a play around with different ones too.
Crew
You will occasionally get a promotion sheet that you drag over whoever you want to promote (in the crew management page in your home base - next to skills and medals). You get promoted automatically.
Not sure if that answer was very helpful about hte crew, but someone knowledgeable will be along soon!
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