I'm a firm believer that you shouldn't have to use renoun to get torpedos.... no matter what they are. You can go into the Data/Basic.cfg and change the renoun to zero for them and save. Tho I'd do it while "In Base" just to be safe.
:hmm: Is it a cheat, no, not in my opinion. Have you ever read that torpedos had to be bought during WWII for any side? I haven't yet. But that's "player's choice". And the same can be said for equipement.