In looking at the Shopping Cart options of building a website, I noticed that in the "Shopping Cart > Product List > Product > Product Settings > Discount" field of any particular product for the shopping cart, that there is an option to "Enable Quantity Discount".

However, is this not at all possible for the entire cart of products?

For example, if I have a "Buy Any Two eBooks, and Get the 3rd Free" or "Buy Any Three eBooks and Get Three More Free" as a promotion, I'm guessing this is not achievable in the total shopping cart when a customer has 6 different books in their cart?

The problem with the "Enable Quantity Discount" setting in one particular product is that I'm guessing that discount only applies if a customer were to buy 6 of the SAME ebook, rather than going through the entire product catalog and selecting 6 different eBooks, Adding them all to cart, and then being able to have the cart automatically discount the price of 3 eBooks.

This won't work by applying a "Percentage Discount" as that then allows a customer to get a Discount even if there weren't 6 eBooks in cart for example.

Is this not possible?  And if not, might I make a suggestion to create an "Enable Quantity Discount" feature within the "Shopping Cart > Options" tab?  This feature would be very useful to have in the entire shopping cart as well as the product itself.