Suggestion: "Next post by this user" button

Looking for something similar to the "1 of X Riot Posts":

For each poster (but especially the OP if you can't or don't want to do it for all posters for whatever reason), add a box at the top of each post with "Post X of Y posts by Person". I often want to skip through a thread and find responses by the OP, or more responses by some person whose comments interested me. Right now that is a manual process; would be great to be able to jump around with a button.