Wow, I've never heard of a feeding specialist. I wish I could get a hold of someone like that for my six year old DS! He is the pickiest person I have ever known. We fight ALL the time over food. We've tried everything.
I personally think he has SPD too, only he is over sensitive instead of under like my DD. He has lots of sensory-avoidance symptoms, but they're lots less obvious and less intrusive than my sensory-seeker. I mentioned it to his dad and my in-laws and they flipped out and thought I was imagining it. But I told my mom I thought he had it too, and she said, I think you're right.