My vote goes with "post it" too. If you want to incorporate it into something else later, I don't see why you couldn't. And as LabRat points out, we aren't posting only plot-driven, finished stories here. If it's more of a fragment or as you say, missing scene sort of thing, it will just make us all clamor for more (of course, we would all clamor for more even if it's a complete, finished story, you know
).
