Bukkit

ok here is the idea

when you completes a quest or comes to a certain level in the quest a redstone signal is given somewhere.

also another idea is that when you are at a certain level of a quest or have completed it you can step on a pressure plate in front of a iron door that you couldn't step on before.  so that the doors open

Or that you can set a location on the redstone input, and in de quest that is a trigger will power the redstone on/off

but back on the presure plate this is a good idea, can also be workt out with lwc and midquest permissions rewards.

the good think about allowing someone going on a pressureplate is that no other player can wait around the quest an enter when the door opens for somone else. it at least is harder then