Fortunately, I've had the chance to work as a sound designer already in the preproduction stage of most productions I've worked on.
My way of working usually comes down to reading the screnario, making comments on possible options for sound and writing a sound design concept including some musical choices. I have the idea that this way of working is pretty good but not optimal for the use of sound in film. More than often, your concept is being read, commented on (also in positive ways) and then forgotten.
So I wonder, in what ways do other sound designers use their influence in the preproduction and scenario development stage? Hoe do you use your knowledge? And how do you keep the entire crew aware of your ideas?