I've been wondering this as well, and unfortunately, have no answer. On Prefundia (a pre-launch website), they allow creators to edit during and after the review, but I don't know if KS follows the same format.
"Four Elements, Four Nations" - a book about the political and social themes of "Avatar: The Last Airbender" - is now on Kickstarter!
Well I just found out. No it does not stop editing; you can edit after submitting, and after they decline the campaign because it is not finished. Then you re-submit by clicking the now-visible "Appeal" button.