Hi, thanks for the suggestion.
I'd been holding off on making this type of graphite synthesis a core piece of the mod, because the primary source of graphite from hydrocarbons is from petcoke -- coke made from cracking during oil refining. I was hoping to eventually make petcoke a proper intermediate. What's cool is that petcoke can be made to make <ahem> synthetic natural gas. So it ties in with that mod as well.
I'll re-examine this and see if I can make it work. If it's not something I can do soon, I'll add in an option for making graphite from normal coke or coal, similar to what happens if you turn of flake graphite ore.