If you plan on adding the industrial coke oven, consider the fact that Coal is renewable through Wither Skeletons and UUM.
Maybe doing it the same way as Railcraft distinguishes UUM-Coal, add NBT tags for them and a tooltip? Maybe Coal - Wither and Coal - Synthetic (would use Railcraft version if available, of course.)
I'm not sure if this is really necessary. wither skeletons are very hard to farm without overpowered soulshards, and UUM is creative mode in vanilla IC2, so there isn't much point in balancing around it.