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What questlines would you have wanted to see for the non-EE companions in "Throne of Bhaal"?
I figure Edwin would take another crack at figuring out the Nether Scrolls, and the player could choose whether to help or secretly sabotage him - if he succeeds, you get a lich party member for about a week until he finally turns on you; if he fails, you get to keep Edwin through to the end of the game.
Aerie would finally track down the slavers who took her from her home, and decide what to do with them now that she's an all-powerful archmage with a Rashemi bodyguard.
Thoughts on the other party members?