I was going to make some iron, so with my ADD (not really) I started browsing through the options for steel. I noticed that you can only make steel with gas and coal, while you can make iron with gas, coal, and charcoal.
Is there a reason that you can't make steel with charcoal? If there isn't, then my suggestion is to add an option to make steel with charcoal.
EDIT: Note to self: don't post suggestions first thing in the morning
