If you want to import a batch of scanned PDFs without converting them to searchable PDFs right away, e.g. because you want to run the time-consuming OCR process later, you can easily do so. Import the files, e.g. to a group ‘To OCR’. Later, make sure to check Preferences > OCR > Original Document > Move to Trash, select all the documents, and convert them in one batch using ‘Data > Convert > to searchable PDF’. This replaces the selected scanned PDFs with searchable copies and deletes the original file in one batch.