I am wondering this exact same thing. I recently did a rollerset and I just can not blow my roots straight (although the Healthy Textures tutorial helped). I figured that by the time i use all of that heat trying to blow them straight, I could just spray my roots with heat protectant and hit it with my flat iron. When I use the Maxiglide with the pins plate my roots always get very straight. I mean, at least I would not be flat ironing the most fragile parts of my hair...
Does anyone know if doing this is defeating the no-direct-heat purpose of rollersetting?