I would like my Jedi consular to be a good guy, that sometimes loses control. Is that even possible?
There are opportunities. The one that first springs to mind is that you are always given the chance to show mercy to a defeated foe. Perhaps your consular takes betrayal very badly and offs all of your opponents. Also pre-battle conversations with enemies often have a "Shut up and die" option. You are generally not going to go ballistic at the general populace of quest givers - the consular is mystical and intellectual so his unfriendly choices with those characters will be more in the realm of "I can't believe how simple-minded you are"