Is it possible to offer quests to players based on a tag assigned to them... and as part of the reward process... assign a tag to them? so you could make layered quests. i.e. finish quest A... assign tag "quest_complete_A" ... the next time they return... it checks the player and then offers quest B... etc...

This isn't possible with this mod. I decided to have a more additionally way for quests instead of being able to have a quest line.