accounts mapped to "Shipping Charges", "Adjustment," "Shipping Cost," and "Discount" fields

accounts mapped to "Shipping Charges", "Adjustment," "Shipping Cost," and "Discount" fields

I wish we were allowed to choose which Chart of Account accounts were mapped to the "Shipping Charges" and "Adjustment" fields on Invoices and to the "Shipping Cost" and "Discount" fields on Bills.  Currently all of these fields are hardcoded to either "Other Expenses" or "Other Charges" accounts.