Well, no offense but I have tried supermods which all too often go too far the other way and modify things I don't really want modded. Fuel is just one example, either you run with unlimited fuel and never have to give it a thought, or run with realistic fuel and have to let the Yamato steam off over the horizon since you'll run out of gas trying to do an endaround.
That's the file I THINK everyone is talking about, \Data\Submarine\NSS_Sargo\NSS_Sargo.sim, only it says the range is "predefined", does that mean it's hard coded and can't be changed, or predefined in a different file somewhere?