You can get 4.x here:
http://www.commanders-academy.com/fo...ead.php?t=7295
It is NOT compatible with 1.04, but if you want to try it out, it should give you an idea of what future mods might look like.
As for the speculation about techniques and whatnot, I'm really not sure. I don't know how stealthy a torp is, and I suspect in many cases the HPA discharge gives it away anyways. What I do know is that a torp's best range does not occur at its top speed, so from that point of view, I definitely agree that it doesn't make sense that a torp doesn't accelerate as much as it can w/o washing out after acquiring a target. Without having that capability, there isn't much reason for us to adjust the speed of our torps.
You can still surprise the hell out of most AIs by firing on the other side of the layer. Sending a torp on the opposite side of a layer and doglegging it also works wonders in denying a snapshot in MP.