Tbh as a competitive player I really like the Idee of Cosmo before I started playing Chronicles,I was a very good end game player of bns,they had something called challenge mode for dungeons with various weekly changing buffs just like he said in his post.Also doing something with farming gold at the same time would be a great Idee VoR rly isn't something anyone likes.But as Idhril said a NPC or Wall inside Dungeon would be needed so not everyone is affected by those changes.A lot of people still can't do the HM instances because they don't find groups that would be able to run through it.Those people would have even more problems if they wouldn't be able to change mode by free will.