We have a bit of a special solution where we use your awesome package and the customer loves it. But we also have TONS of variants on our products. To make sure that these variants get added correctly to the basket we have to add them as a uniqueline and then the discount dosnt work, but in this situation it should. 

And i would hear if the source code is available since i think its easy changeable but instead of bothering you with it I could handle it myself :)