Hi Paul, if spraying your rolls seems to help, then there's no reason you shouldn't do it. You do want to be sure to keep your rising dough moist, so if you find it's drying out on the surface you might want to use plastic wrap that has been lightly sprayed with baking spray to cover your dough rather than a cloth towel. When it comes to adding steam to the bake, if your rolls bake at a relatively low baking temperature (350F/ 177C), it's probably not necessary, and if you already brush your rolls with melted butter or an egg wash before baking, these measures will also serve to help keep the dough moist during the oven spring period, so spraying before baking shouldn't be necessary. 

Barb

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