Blackrat
He Who Lurks Beyond The Veil
Dark side points and Force powers are somewhat of a problem. My own interpretation of the situation (which derives from old experiences with the d6 game, although I'm playing in a current Dawn of Defiance game), is that if you use a Force power to directly harm or kill another living being, you gain a Dark Side Point.
I'm with Merric here. Strickly speaking, any use of Force to do lethal harm is trangression.
But as a GM I might be lenient enough to give you chance to use it to do Stun damage and as such not getting dark side point. Suggest this to your GM and see what he thinks of it.