At a basic level, it could just be inserted into each users homenode stats, e.g. have a "Now viewing node ###", or "Now editing node ####".

Impossible. Or rather, difficult to determine when the user has completed such an action. If I view node #xxxxxx and then close my browser, how long until you decide that I've finished looking at the node? What happens when I've loaded multiple nodes simultaneously? I frequently have anywhere from 2-20 nodes opened in my tabbed browsing. Within the MOO/MUD, are you planning on magically cloning my character and placing him in all 20 'node rooms'? :) Now that'd be twisted.