There is no method to create a sku for a single product. Looks nice if you want to generate skus in bulk though.
Thank you for your review.
Actually, you can create a SKU for a single product if you send it to the app from the product editing page. Please go to the More actions menu, then select 'Generate SKU'. This will send the product to the app and you'll be able to generate the SKU.
I hope you'll reconsider the review.