Hello!
Yes, the feature would be for uncomplete quests only. It might even be a command that only a GM can execute on a player character if you fear abuse. The player would call a GM and explain the situation and the GM would reset the quest if the case is reasonable.
Unfortunately it won't help me with my current problem or I would have to wait until such a feature is implemented. What is even worse is that it is the second quest of the NPC so I would have to complete its first quest again, too, to get the item with a second char. :-(
With kind regards
Kaityra