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Have not looked into this just yet, but will investigate supporting it in the next round of updates (probably about a month away from starting that).

Appears that the CouponStruct structure was modified; our script was using one of the members (m_IncludesFreeShipping) to help calculate the discount and return that information to OM.
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I've had at least one other user report a regression in the latest script for this feature - will try to confirm this afternoon and see if a fix is necessary. If not, you know how to reach me...