I think we're coming at this from different directions. I assumed the request was to do as was exactly worded, to mark a thread as unread. Essentially to just put a tick with a thread as a reminder to go back to later. I still don't follow the logic to doing it the way you're suggesting, to mark individual posts as unread would be hell to manage.
Would the OP care to clarify exactly how you wanted it to work and its purpose?
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