dropwp

Once activated, this plugin will override all product status changes and set them to DRAFT. This way you could have a bulk importer and only publish your products once you have already revised and updated them.
To override this status change, simply add a custom_meta to the product with name ‘dropwp_disableproducts_skip’ and value ‘1’.

Dropwp Disable Products

Plugin to create all WooCommerce producst on DRAFT status until a custom_meta is added.

sakisbal

This plugin is not of any use for general themes but is specifically created for 
my main theme perfectPortfolio.

perfectPortfolioHelper

The plugin is not for general use, but its a helper plugin for my main theme

Dropwp Disable Products vs perfectPortfolioHelper