You'd need to add the ability to manually con the ship (rudder and speed control), optics for the torps, and a torpedo computer, to really make it reasonably realistics. However, for now, just spawn pt boats. Personally, I'd rather see them make the front and rear main gun turrets man-able. That would really give ship-to-ship more punch, and something to do when your cruiser and CV go down.
Better yet, make the DDE a perked ride, with all guns man-able, direct helm control, and torps. That would be real cool!