Notification of recent activity & changes

Our company assists clients in building their sitemap. We guide them in having the client add their own content.  I see the “last saved” feature, however, you can not track when a client has logged in and worked on a particular page or changed the status of the page. One step further, it would be very helpful to be notified when a page status has been updated or what individual page tracked activity.  I have “email when a comment is added” notification toggled to “on”, however, the comments are in one section, versus on individual pages. I do not see this notification or comments feature to be as beneficial as it could be. These additions would really add value to both businesses and their clients! Thank you!