[Mediawiki-l] Page approvals

[Russell, Elizabeth]

I've got a user group that would like to put policies out on a wiki,
searchable and viewable to all but only editable by a few.  All of this
I can do for them.  
 
The next thing they want is for someone to be able to "approve" a page
online.  For this I am envisioning an "approve" tab/button along the top
that adds a signature line   (I'm pretty sure I could figure out how to
do this).
 
I'd like the signature line (~~~~) to be put on the "Discussion" page,
or maybe an "approval" page, but I'd also like this approval page to be
non-deletable... can only add text to it.  (This part I'm definitely not
sure how to do. I do see the '+' tab on our discussion pages though.)
 
And, the last thing they want to be able to do is email the pages that
are ready to be approved, something like the "email page" button you get
on many websites.  I've looked for extensions that have a button like
this, but no luck so far.  
 
Has anyone done any of the above?  Possibly it's so simple it doesn't
even need an extension, or possibly wiki is the wrong platform for doing
this.  Users are liking the interface so much though, that they want to
adapt it to very specific needs.
 
Many thanks,
Beth