I'm pretty sure I've seen this answered before, but I can't find the answer via search: I want to exclude the pinyin field from being populated when "fill in missing fields" is enabled for flashcard imports.
No way to do that at the moment - instead I'd suggest leaving that 'fill in' option off and then filling in the specific fields that you want filled in after the import is completed via Batch (which will let you do them individually instead of all at once).