My wife and I play Hand and Foot from time to time. We have toyed with the idea of allowing a book of 3's to count positive, with the caveat that they are only positive if the book is closed and clean. If the book is not closed and clean then each of the 3's has their usual negative score.
We have not found this particularly effective because if a player attempts it then the state of that book determines the winner of the game.
My question is if anyone else has tried a book of 3's in Hand and Foot and if they have found a way to make it work.