Get you still the version 1.5 (UBM), then you can also use the whole large Modi and ModPacks.
The -which SH4 particularly well- is the team management... once properly adjusted, it runs almost by itself.
In addition, one must not forget that the USN and the Silent Service in the IIWW was the only one a successful submarine warfare.
To the user interface you get used to relatively quickly...
