Andy improves his tool constantly (curent version is 1.90). So there are updates regarding (U)EFI. But AFAIK there is no general way to introduce a new acpitable (SLIC) that is suitable for all UEFIs if there is no one at all....middleton had provided code that is able to perform that. I suggest to you to send your UEFI to andy and ask for an solution. Andy is busy, but you can ask him anyway....