Check an order's products condition doesn't work with alternate SKUs

My client is building a coupon that applies to a product that has a lot of alternate SKUs based on various attribute combos. The core product SKU actually never gets used, because it's impossible to buy the product without specifying an attribute. However, when he goes to build a coupon for the product he's only given a list of regular product SKUs, not alternate SKUs. He tried using the main SKU for the product, but since he always ends up with an alternate SKU when he checks out the coupon doesn't apply.

It seems like uc_discount should take alternate SKU's into account, since a store owner might want to give a discount on a particular product variation. Would it be appropriate to alter uc_discount so that it loads all alternate SKUs as well as primary SKUs when you build this condition?