Hmm...
Civil War quest? Don't you have to personally execute the leader? Perhaps not.
No, you don't.
Getting out of Helgen just by hiding and letting Ralof/Hadvar do the job is easy and doesn't take much longer.
But since most of the questline require the deaths of certain NPCs (or dragons...), I find it hard to do a true pacifist. Someone who lets followers and summons kill for him/her, on the other hand, should be viable. I have an idea for a pacifist Orc, who only uses Illusion, Speech and Restoration - and cares much about her looks and loves pretty clothes. Probably won't play her for a few months, though (would love to get a PC first so I can use mods for followers and pretty clothes). So many ideas, so little time...
