[max-peck]

Actually no scripting required for TMO only.

See screenshot



This is from the 42a Convoy layer for TMO.
You'll see that generic entries have been used.
Generic entries have also been used in the troop convoy layers I have checked, and in the single merchant layers I have checked.

All you'll need to do is add the ships to the Japanese roster and they will show up in game.

I've added a load of ships from FOTRS into my game.

All I needed to do was add the ship folders (into the Sea folder), and add the ship cfg's into the Japanese roster folder and the ship entries into the names cfg.
I haven't edited the campaign files at all, and I see the new ships all the time in my campaign.


EDIT: Just to clarify.

The above is true if you are running TMO only, as Bubblehead stated in his original question.
If you are running TMO plus RSRD then the campaign files will need to be edited, as specific entries have been used in RSRD for convoy group contents.