We offer food and if they don't eat it thats fine, if they eat it we find it helps them with their shed, we can usually tell if they will eat it or not, if their yes are basically white they won't eat it, if their eyes are just starting to go milky they will eat it and if their eyes have gone back to normal they will definately eat it. We have one snake that eating during a shed cycle always helps him shed, he will eat then within a day or two he will shed.
I do think you need a bit of common sense when feeding while the snake is on a shed cycle, like don't offer a food item that is too big for them or will stretch them too much, but then most feeds the snakes will only be offered a food item we know they can handle with no issues so the food item won't be too large for them the general rule of thumb is that the food item is not bigger then the width of the snake, but i thought most snake owners did the same.
mrillusion i am wondering too why you choose not to feed during the shed cycle? I don't think its right to say a very strong no without backing it up as to why you believe this, i don't think anyone will flame you for your decision.