"This isn't about structure, this is about energy savings. Do you realize how much money you will save over the years".
I have to laugh at that because I am sure that he doesn't "know" how much anyone would save over the years. I am sure there is an entire calculus for figuring the energy savings on something so small but my common sense tells me that it just would not be worth it.
Check your State Energy Code on-line for the requirements and reduction for sloped roof. That is what the AHJ (authority having jurisdiction) does. My State is one of the few with it's own Energy Code......
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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?