Nice post, gave me a lot of ideas.
Your sense of honor reminds me of a mandalorian, along with your vengeful nature. i always wanted to be a mando in any star wars games i play, so good for you. I think merciful actions do carry benifits as well, but my knight will tend to kill sith, especially if i think he'll just grab his lightsaber if i let him go. also, if you do go dark side, you should probably imbrace it fully, feel its power flow through you. But, it's your charector, don't let anyone tell you different.
Dragonbolt, Knight of the republic