Don't think you can the rank but you can the names. Go to your SH4 saved game files in your documents/sh4/data/cfg/savedgames/0000000x.
Write down the names of the crew in your boat that you want to change.
Open the saved game you want to change with notepad and click edit/find. Then type in the last name of the crewman you want to change, let it search, then replace it with the name of your choice. After you do it once it's easy.
TIP: Make sure you look at the first names also because many times crewmen have the same last name.
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