There has to be an assigned objective in order to get points from picking the "survivors" up in a designated zone. You can manage to pick them up, if they are the same nationality as your boat. We've put other nationality 'survivors' into the FotRSU mod, and they can also be picked-up, though they are Allies, and they are assigned missions... I might try some Japanese survivors later, and see what happens. If it works, maybe have a mission to pick-up some sinking survivors for interrogation back at headquarters...
There is already a "Survivor" in the Data / Sea folder, so all you would need to do is make a copy of the Survivor.cfg file in the Data / Roster / American / Sea folder, and paste it into the other countries' "Data / Roster / Country / Sea" folder, then do editing to change the "DisplayName=
Country Survivor" to match the folder, such as AU for Australian, GB or UK for Great Britain, etc. Match the abbreviations to what are in your game. It would be best to put the new CFG files in a folder structure like "NewSurvivors / Data / Roster / Each Country / Sea / Survivor.cfg", put the whole structure in your MODS folder, and "activate" it with JSGME. That would allow you to back it off if something goes terribly wrong...
- not saying it would, but ya never know...
