Currently I see no built-in option to disable metals and their items. If I don't want to use some metals I, I would have to disable all recipes and hide all items of those unwanted metals using crafttweaker, right? (in my case thousands)
It would be easier for pack makers if there was a global config. Something like
"B:'Enable all items and recipes using cobalt'=true"
"B:'Enable all items and recipes using osmium'=false"
or similar.

Thank you for your work on this mod so far!

Added in #53