I'm looking at this as an option to enable some tweaks of a few early game recipes by removing coal as an ingredient and then replacing it with carbon in order to allow an extra crafting step to make quality up-scaling of those items smoother. Combined with a greenhouse mod it would allow for automation of rare Carbon and that could be used to make rare grenades for military science. Would it be possible to add an option or a separate mod to remove wood as a fuel source entirely (doesn't burn hot enough to melt metals) in order to prevent inserters from placing it in the fuel slot and only treating it as an ingredient for smelting into carbon? I think locking that recipe behind steel processing would be early enough, before that wood would only be usable for crafting.

That would probably be an entirely separate mod, I think, as it's a bit out-of-scope for this one. Frankly, I would be shocked if someone hasn't made one already. I'm currently working on getting my mods prepped for 2.1, but I don't have a problem throwing one together when time permits. Assuming it doesn't exist already.