Extend shipping discount functionallity

[pkilli]

Hello, hope this is the place to ask this;

What is the best way to approach this following issue?

We want to use the shipping discount functionality.

But since the Shipping discount is not an actual discount, but is just an adjustment to the shipping charges, there is no trace of the shipping discount amount.

We were thinking of extending the shipping discount functionality to keep the original shipping charge, and add another shipping charge that would cancel out the original shippment charge to reflect the shippment discount.

Would it be advisable to create a pricing request trigger and/or a request handler to modify the response of the CalculateShippingDiscountsServiceRequest, or is there a better approach to this?