I think Lez may prove more dynamic in this regard. I have a feeling she can be turned later. It is fairly obvious she is bound for disappointment and disillusionment in her personal quest. I have had a few exchanges where she has expressly disagreed with my decision but approved of my handling of situations. Despite the fact I cannot bring myself to play the villain in a video game (I am terribly in love with tragic heroes whose inherent flaws ultimately lead them to destruction), she and Shadowheart along with Wyll are whom I will be taking into Act 2 with me. I am sucker for redemption stories
I've seen the same hints, and I really do hope that the writers would make Lae'zel malleable to a degree, she is practical anyway, and if she sees that "the good approach" works sometimes much better, that would be a good start for her character to get rid of tunnel world view she got due to her upbringing.