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.)
Take a look at the FlaggedRevs extension - it doesn't do exactly what
you're saying, but it's close. (I think the extension is still in beta
testing, though, so be warned.)