In my opinion, you should approach the "Documents" quest, the same way as the Cards/Chest of Wanders quest: more clues
A quest being active for a long time is no problem, everybody has numerous quests open - after all this is the meaning of free form RPG.
The problem is a quest that cannot be solved due to a lack of hints on how to proceed
The problem with the Documents quests is that each document is a separate quest and completely unrelated to the others. There is no reason why there would be a clue to point to the next document's location.
I have finally managed to obtain the feather and were told to show it to
Marana Rian and I think she took it! I have searched her house and her
but I cannot find it, I am going to need it to finish the quest or?
I went to Cheydinal and willows bank but I cannot get info out
of the fellow in the church, I have obtained the necklace and I am
pretty certain what I am going to do with it but this damn feather, I
should have paid up the 50 000 directly.
The feather shows up as an ingredient in your inventory, did you check there? She doesn't take the feather (not if you show it to her anyway).
What happened when you talked to Marvo at the chapel? Did he have a custom greeting? And what necklace are you talking about? Sorry, my memory is fuzzy.
What you could do is add travellers that walk from Anvil to Leyawiin by road, and who will give you quests once a day when they see you. Some of these quests could be easy, and others take a while. But make sure that they don't give new quests until you have the first quest they gave you completed.
I'm not sure what you mean here. Are you talking about any quests in particular?