Chiseled Bookshelf - Functionality ideas

I think it would be a good idea if you could dye books colors to more easily access them from the chiseled bookshelves. Of course, for this to work chiseled bookshelves would have to behave slightly differently.

Right now, if you put a book in, it will appear to the top right in the bookshelf. Put another and it will fill up the next space. Instead, I think it would be a good idea to fill the book space the cursor is in and take out the book at that slot as well. This would allow for a much more realistic bookshelf and would allow for choosing books instead of just taking them in order.

After this, if you did add colored books, the books displayed in the shelf could be colored to match, which may make it easier to remember which is which when it is on the shelf.