C06: Finished by defeating Azhakul the fire reaver and destroying the idol of the fury. Edn reward given by Hraag. If you finish the quest with zero time remaining on your pass you can zone out and be on the island, and get your reward from Hraag by walking back to him.
Catacombs: Finished by defeating the wraith of Arcasic(sp?) Dryden. End reward given by Friar renau in the marketplace.
These were the cases in the only instances of running these quests I have had with f2p players on a pass. I'll need better examples of quest chains that behave like deleras in such a circumstance, as those two do not.
Turbine could still do this, however I'm not sure how easy it would be for Turbine to "flag" a toon for a particular instance.
you click the pass, the player can enter the first part of deleras. The player finishes it, and then can only enter the second part, and so on until the chain is finished, making farming on a pass impossible
Who knows. Pipe dreams are always so Pipey.