Okay, explain to me this: What will spending Greg's time to make your advanced alloy furnace provide to gameplay? How is it better then, say, nuclear boilers? Or the whole assortment of first-tier bronze machines which Greg is currently working on? Or whatever else Greg has planning for the near future? What will your alloy furnace do, other then energy efficiency? Considering that the alloy smelter already consumes pathetic amounts of EU, this is a rather weaksauce reason to add a new machine. If you want it to add new alloys, why not use the blast furnace? Just kick the alloy's heat requirement up to 11, and that's basically exactly the same challenge to the player as adding a new machine, but with much less work. Are there any other reasons for it?
"multiblock Alloy Furnace for processing certain items (such as putting in Iridium and Osmium and then some Aqua Regia to get some Osmiridium)."
Not necessarily just for smelting, perhaps it has a slot for a strong chemical which is processed from another machine I suggested. Again these suggestions I make would come at a level after making a fusion reactor, to continue being able to make machinery that does more powerful things and are more complicated.