to be honest it would make sense to put the quests from different worlds in their own tab along the top so then you are looking for what quests you have in a certain world and you only see the quests that are there.
Nice thought but not possible realistically. There are too many quests that require crossing worlds at some point in them. It would however be nice if quests were listed according to worlds and not jumbled up. By that I mean first page being the lowest world quests and last page being the newest world quests.
A HUGE improvement to the Quest Finder addition they just added would be a Storyline button. Stick it in the Quests tab, when you click it, it selects the current quest in the storyline that you need to do.