The ability to assign Shipping Method Rules to a Discounted Categories.

Issue: Shipping light items internationally (e.g.: stamps, etc.) using flat rate Shipping Method Rules.
Problem: No option to assign Shipping Method Rules to a Discounted Categories. Only option is to individually assign each product to desired Shipping Method Rules or via import, which is not ideal for obvious reasons, especially with many categories with hundreds of products in each one. Many always manage to slip through the cracks -unnecessarily frustrating.