For SH4 there is also a recent compilation done by Bleiente:
Ralles RealModPack V1.2final full
https://workupload.com/file/cQjXAQh
Ralles ModPack for TMO_RSRDC_OTC V1.3single Update
https://workupload.com/file/dybLZ7s
It changes the visuals, makes the interior compartment's navigation much easier but also adds a lot of realism features. It's flexible as you can take out the most realistic-demanding things to make it easier if you want.
Before trying this mod I didn't like SH4 at all, but after using it for only a little while I discover an entire new game.
But I'm too much focused on SH5 currently which has it all and is unrivaled IMO due to its automation features (scripts), just to highlight one feature in the mass.