I never had fabric stretch from spray or steam, if a person doesn't "iron" the fabric but gently press it, there shouldn't be a problem. I do use spray to shrink broadcloth when I use it instead of washing and drying it, it works.
I like broadcloth because of the color selection and the price, for my type of quilts it is good enough for charity and personal quilts. For gifts I go with the high priced cotton.
Carol J.