[Mortow]

In live there were required items such as smithing hammers that could be replaced by Tanaan smithing hammers in recipes. Is there a way in the Emu to achieve this? I have looked at the recipes and it seems like a required item is simply required, there is no place for and either or type situation. I have a massive amount of custom recipes and I would really rather not have to copy them all and change the required item if I don't have too.

Thanks,
Mortow