Hunh. That's interesting. I always wake up hungry and wanting solid food, but on ST days I just puke it up if I try to eat it, as I mentioned in sparrow's thread.
Yeah, if you're eating it as a meal in itself, adding the fiber and fats is actually beneficial in the specific context of slowing your uptake of (what are probably) the very biologically available macronutrients in your shake. This is of course only my amateur opinion, so perhaps when the veterans weigh in we'll get a better answer.