Well, a 2 part question...
1) I/We/People often start a quest before all members of the group are in the quest... when this happens the late arrivals are usually not excluded from any scroll rolls. Will the new scroll drop mechanism include people that aren't yet in the quest?
2) People often Disconnect for various reasons in the middle of a quest... when this happens, the person that dc'd is usually not excluded from any scroll rolls. Will the new scroll drop mechanism include disconnected people and deposit the scroll in their inventory when they reconnect?