Manufacturers manuals are just perfect, no argument. Its just that they don't explain WHY.
Strangely enough, it seems to make a huge difference to various crews as to whose fingers twiddle the knobs this has been a source of more than a few disputes!. Weird, I agree, nevertheless thats human nature for you. Go figure.
Whether this is worthy of a research topic, I'm unqualified to opine. But NASA Ames, and the FSF seem to think so. I will contact them directly, its the weekend and I was hoping that there would have been a bright spark on pprune who would have the answer
The root of my question was "Why is this so?". I fail to see why this seems to invoke memories of horror sim rides in years of old from some posters.
For the record, I am not a carping pedant. I don't have an agenda, I couldn't care less which and whose particular appendage is recommended to twiddle the knobs. All I want to know is WHY.