Alright, I have my tiny plugin "who-flagged-posts", that basically does that list all "flaggers":
$queryRecentFlags = qa_db_query_sub("SELECT postid,userid,flag
WHERE `flag` = 1
ORDER BY userid DESC
// then transform postid to appropriate links
// and transform userid to avatar with link
I can publish this v0.1 if you like in github?
Well, actually I think you could just implement this in core, so that we see the users under >Admin >Flagged... because this is such a basic but necessary thing.
What do you think?