I've read some say that quest items, like books etc, should be set to "Quest Item" so it won't be dropped.

I know one thing I really don't like is to have 100 books in my inventory, even if the weigh 0.

What is the purpose of having quest items remain in inventory?

Are there exploits that can be done to dupe many copies or something if they are "droppable"?

After a quest is complete is there a way to turn it off so the quest item can be dropped when it's no longer needed?

Thanks!

(Hey Brew ... How's that Massive-Mod coming along?)

You've described the purpose. It is to stop a Quest becoming uncompletable because the PC loses the item required ... Like actors, who can be protected so that they don't die and make completion of quests impossible.

So, you have a choice ... make it required (by tagging as Quest Item), or don't ... If you don't, then you let the player choose, but you also need some way to tell the player that the Ancient Book of Power Spells is a required item to complete your quest


As for turning off when Quest is complete ... You need to think about how the item is being used ... You can remove a no-drop item by SCRIPT, so you could have the completion-stage of your quest do just that (if not the stage when the item is actually used ... Easy example: Need KeyA to Open DoorB ... when Door-B opened remove Key from PC via script ... but does the door remain unlocked forever? Better to leave key deletion until Quest complete?)

It's your choice as a modder ...

Yup, the purpose is to prevent players from dropping it and loosing it. A good quest cleans up all the quest items so none remain. (Preventing a buildup)

Whether you do it or not is entirely up to you.

One limitation is that all quest items are hidden by the engine while the player is in jail.

So if you have an item which the player needs to escape, don't make it a quest item.