Could we have a button to select a single poster and then hilight just their posts in the thread (like OP can now appear in green & my posts in whatever colour I choose).
the hilighted posts could all be in pale yellow, maybe, along with other colour fills. The hilight could be temporary, just for the single page or view of that thread, not all their threads.
So when someone has posted & then gets jumped on we can all easily read just that person's posts and what exactly they said vs. what everyone else is arguing about that they didn't say.
I know seaching for the poster's name is just as effective, but I think that's too technically advanced for some MNers.
Sorry if this has already been suggested, seems like a good idea to me.