In academy, when faced with the equivelent of kotors temple scene, you have a character that betrayed you, he is wounded and you have the option to kill him or to put your lightsaber away. Also when you meet up with a few jedi's later on, they start to talk to you and you just push them aside and say "out of my way"
And the build up to falling to the darkside is handled better also, with the whole betrayal thing going on.