Annealed copper has an advantage with cables against copper, as it has less energy loss. There doesn't have to be a synthesis recipe for it, but maybe a decomposition. I agree about the TerraFirmaCraft metals, but the funny thing is, you need them (in this pack) to make the Minechem machines. Blue and red steel are AMAZING metals for tools, so amazing that I wouldn't allow decomposition or synthesis of them. By the way, diamonds need 2 stacks of coal in Minechem, but 1 stack in IC2. This leads to a diamond duplication exploit. The dummy items you mentioned earlier can be added using the CustomStuff mod this pack is using as you know, or mods like Quadrum, RockDigger and a billion others help add blocks/items. Emerald has a much more realistic output in Minechem, by the way. You do know that what you're doing wasn't to help adjust Minechem recipes for GT chemicals, but to fix the GT item outputs?
Annealed copper needs a blast furnace, and you're right about the specific techs thing. The thing is, Minechem machines are literal chemical decomposers. This means they can break bonds of molecules and atoms, separating them and outputting them separately. Then, they're put in a synthesis machine which takes significantly more power, and when supplied with a pattern and the required atoms or molecules, creating the original outcome. Of course the number of atoms an ingot has is stupid in Minechem, unless the vials they are put into hold around one septillion (short scale) atoms, but that's off topic. What I'm trying to say is, they're put into a lot of heat during this process and the patterns of this heated matter such as steel, would be different than a regular iron-carbon alloy, making the Synthesizer able to create metals undergone a heating process.