1) If I eat more nuts than I'm supposed to, let those count as the 10%. The 10% amounts to 1000 calories a week. That can be some fun overindulgence. Fresh-ground peanut butter can fall in this category (I like it with a banana). It's not as healthy as raw nuts, but Dr. Fuhrman doesn't forbid it.
2) Every few months when I get a cupcake craving, just go for it, eat one, and then stop there and don't worry about it.
3) Every few months if I find myself at a restaurant and there is some reason I can't just be my usual crazy self and bring my own food, or maybe I really want to eat the food there, just go ahead and do it, and don't eat too much of it, and don't worry about it.
That sounds like a pretty good Life Plan for me.