All seems very unwieldy this messing about with numbers
Would it not be quicker/effective if you as an admin just simply sent them a link to the comment/post, rather than asking an average forum user to scan thru what could be up to say 50 posts, looking for what may be an unconnected number, say 23781896.
What happens when there's more than one page of topics, and how easy would it be finding this number on mobile/tablets.
All a bit unwieldy to me, and so the return of this feature is not really something that I would like to see invision deploy development resources on, maybe better suited for a plug-in request?