In SH3 there is a way to alleviate the crew management, I only found it yesterday, some mods have it in but I found a post where you change the text in a file.
It always niggles me, I mean in a real life situation I would think the captain has more important things to do than rotate the crew, I'm sure another officer would be given that task.
This is the post I found for SH3, it might also work in SH4 but they rotate anyway.
https://www.subsim.com/radioroom/sho...t=Crew+fatigue
Col.