Slightly off topic but I just want to verify is that require list you show is with fcc edited out? If not then I am curious why FM's sieve always is generating it for me since I don't have anything that would require it.
Also what's the effect of \\flagged? I searched for it and while I keep finding examples of it I am curious what it's effect is?
Update:
I think I found it in
rfc3501 section 2.3.2.