Rigging your tubes for deeper firing

[Dantenoc]

I did a quick search and couldn't find anything (well, actualy, I got a gazzilion posts on completely different subjects), but anyhow, my question is:

Can you change the game so that it allows you to fire your torpedoes from deeper depths? Why are we only allowed to fire from periscope depth? because from deeper I can't see what I'm shooting at? That's my problem and my choice! If I want to waste a torpedoe firing blindly thats my problem! Let me do it!

Is it forbidden because the tube doors couldn't open when very deep because of the extreme water pressure exerted on them from the outside? well... sounds correct in principal, but surely they could handle more depth than just a measly 15 to 20 meters, no?

Is it forbiden because firing from too deep would give the torpedoe a hard time to achieve the desired depth? well, then let me shoot from farther away to permit the torp to rise on his way to the target!

Well, anyway, does anyone now what file variable/value I need to change for this?