One thing that's really driving me crazy is the constant resetting of torpedo settings in the TDC (full manual targetting). I set all forward torps for fast speed, impact detonator, set spread angle and depth. Then I open all torpedo doors. After a short time I hear clicking noises and the detonator has switched back to magnetic, as well as screwing over my angle input. The torpedo depth seems to stay as input.
Another annoyance: the tube doors seem to close again each time you choose another tube. In SH3 I could use the 3d-switches to keep the doors open, in SH4 there aren't any anymore...
PLEASE, dear devs, fix this.