I'm frustrated that after torpedoing an enemy ship or watching a friendly ship sinking, that I can't rescue the survivors. That just isn't right.

I think it would be more historically accurate if you can pick them up for some "renown". However rescuing sailors of different nationality would have an impact on your game play.
For example, if you try to rescue Japanese sailors, they may cooperate and allow themselves to be picked up, may say "No, go away!" and may try to get away from your sub, or worse... they may be "fully loyal to the Emperor" and try to blow up OR damage your sub with explosives in their life raft/boat!
I really do hope that we can chose different campaigns in SH5, like Japanese, German, American, and perhaps even British.
What do you guys think?