Bronann, Kalya, Orlinn with Crystal get in another world. In this world exist another not kind Bronann, princess of evil, which looks like Kalya, very sly man, which looks like Banesore. Main purpose - turn time back.
How about to create several ways (2 wrong, 1 right). Wrong way is going to bad end of game with ending credits. Anyway, we get 2 addition ends of game.
This and more has been considered I must say.Once I've got a good grip on Ep II, I'll see whether the possibility to add a few story changing choices are possible. But I'll be honest, I'd script the main story first and work on such possibilities afterwards, except not too hard.