Would love to be able to read the book without having it in the inventory.
I second that. Although I haven't progressed extremely far into the game, so far all the books that i've looted usually sell for between 1 and 9 gold.
Would be much simpler to allow me to simply read them without picking them up so that I don't even have to bother with selling them and know that I've read them. More times than not, I meet up with a seller and then think "I'd better make sure that I've read all of the books I'm trying to sell" so I cancel the sale and read all the books again, then I open up trade and BAM, I see a book and start to wonder, "are you sure you read that book?" and start the process all over again.
I'd just assume give up stealing books and be able to just read them and not have them go into my inventory unless I wish to take them. I've played other games that allow me to read the book without stealing it and then steal the book if I still want to.