Ryūsenka Hyōrō Exgamer has requested about 240 days ago a bingo book... and I took the liberty of putting that in today after quite some development time...
This hooks in at the same place the friendlist does, but has no char stat display and no accept feature... as a bingo book is normally a one-sided thingy...
Ok, you can simply put in and remove people you don't like ... and also put a short comment in the book.
Oh, and: the books are not 100% safe... people might get the information about them you have in the book somewhere... although not the complete bingo book and nobody can get info about "who does not like whom" but only "who does not like *ME*" and so on.
Happy Easter.