It happens to me a lot when I am editing or adding a page, that at the same time I think of a colleague that I want to share the page with. So that he/she sees that I've added a page or that I wanted him to know about this (and future information)
Therefore it would come in handy that in Edit-modus, you can add a watcher, so when you save the page, the colleague gets informed instantly.
I think it's the best place to add it next to the icons from label/restriction. I think an extra icon, in green or someting, would definately be clear to see.
Hope you can have a look into this