First thanks for adding the product import feature, long overdue!
It would be nice if the importer supported:
custom fields : for setting any other types of info like yoast seo settings
publish date : I have created a "child plugin" for marketpress for running DealADaySites and need to set the publish date
image : without the product image(s) really have not saved that much time, could do it like magento importer where you put the images for the upload in a dir then add the file name/path to the csv and the importer makes the association