One of the great things about this plan is that it's perfectly alright to tweak it a little for you, if you feel you need to. Personally, I've always said that an apple or a raw carrot or some other small portion of fruit are acceptable, up to twice in a day if I really want / need them. They helped me a lot in the beginning before my sugar cravings lessened, and as I would have eaten them anyway along with lots of junky snacks, I couldn't see it being a problem.
Nowadays I'm still 'allowed' to eat up to 2 portions of fruit a day outside of my 3 meals according to my own version of NoS, but mostly I don't actually want or need to do this. Just the knowledge that I CAN, helps me. I suppose it's kind of giving myself another safety valve, another allowable way for 'controlled failure'. Afterall, if the alternative is emptying the vending machine of sweets in a short space of time, isn't it better just to eat an apple?
Of course, the classical version of the rules will tell you that you should eat the fruit 'instead of, not as well as' some other less healthy thing in your diet. Basically, whatever you decide will be fine, as long as you remain true to yourself and know where the boundries are. For me an apple is OK, but a pile of crackers or a bag of crisps is not. a raw carrot is fine, but even a small slice of carrot cake is not.
Good luck whatever you decide, and please let us know how it goes.
C.