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Sugar does nothing for plants. Molasses (which is left in Sucanat) provides a source of nutrients and the little bit of carbohydrates help boost microorganism growth, so you can use it as an additive if you want.
I used to use molasses when I first started growing and could never tell a difference in the final product, but it didn't seem to hurt anything. The amount to add can be searched for pretty easily on this site.
-------------------- “The Universe is under no obligation to make sense to you” -NDT