Sadly on p99 you will only find quests that have been completed at least once and confirmed/posted online somewhere, since it's that type of research that the devs used to write the quests for this server.
But yes, I bet on live there are still all sorts of things that have not been discovered. As cool as it would be if it were true I doubt activating unused druid rings or anything quite so big would result from them (basically because zoning at the time involved spells, item clicks or verbal interaction with an npc) but even unlocking some more lore that nobody has ever seen before would be neat.
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