Right now the keywords only apply to the whole batch. It'd be great to have the ability to add keywords during import, like how you can keyword in the catalog, image by image.
I have a walk around camera that I only import every month or so, and so the images will end up having multiple locations/subjects, so it'd be great to be able to do some quick tagging in the import process, since I don't always have time to do it once it's sitting in the Previous Import collection before importing from another card.