MarkInPageTree
New module which does what it says in the title. It adds an icon to a page on the page tree if -> a specific field is true and / or is a specified template.
For example I'm using it to add an icon to any page that has a checked (checkbox) exclusive field. This helps with admin clarity as you can see instantly which pages of the same template have differing content (i.e. are exclusive or not).
https://github.com/benbyford/MarkInPageTree