Stan,
What I think would work is to put images with not a single word of rationale on the 7-day clock, while putting up poorly-worded rationales into a category that will get further review. Ultimately I would like to see all fair-use rationales come from a list of approved texts; if an image doesn't fit any of the pre-approved rationales, then we require it to be thrown out. We'll forego some images that might have new and creative justifications, but win overall by not having to have endless heated debates over fine points of rationale wording.
Yes, I think that this would be a good way to go.
Jkelly