flagging

I really like the Wikipedia flagging feature where articles that need work can be flagged (such as {{needs citation}}). I've been thinking about the best way to implement this in Drupal with a wiki system. Some possibilities include:

1. Flag content - http://drupal.org/project/flag_content - Is limited and does not allow for users to specify the reason for flagging the node. Also does not put a note on the node itself (like Wikipedia does) when an node is flagged. The flag also does not show up in revision history.