Books suggestion

I've been (slowly) adding my books and have noticed it seems to default to marking them as 'read', and I have to individually mark them as 'unread' (I have *many* more unread than read books).

It would be a great help if there was a feature in which one could "select all" of the books in ones book list and perform a single 'mark unread' operation on all of them.

When i do an overhault of the multiple select items I will add this (also going to add mass tagging)