Could you please explain each settings? Or at least give hover text information about the settings?
Perhaps you could do me a favor by explaing it here? About simple huging, in-book world, and hold up all items.
Thanks.

In-world books allows you to see the books in that position, and what is written in them. But this only works with the First-person Model mod.

Unfortunately, I don't know about the other settings either.

Hover text was added some time ago.