The installer-code in HDLoader is a bit different from the one used in Toxic. The code in Toxic supports installation of dual layer discs and it propably has the V12 install issue fixed in it too (haven't even thought about it until now).
I've tried using the code in HDLoader and it can currently install only one dual layer image (haven't had the time to see what is actually preventing it from installing another one). It also needs to be changed a bit to support Crazyc's way to get dual layer images to work in HDLoader as we have no idea how Sjeep is handling them in Toxic (yet images installed in HDLoader that way should also work under Toxic as well).
--- Signatures are just lame excuse to waste bandwidth ---