The recipe combinator can find recipes based on what it outputs. Can you add another option to find recipes based on the inputs it needs? It could dramatically simplify some circuitry I'm working on.

Hi, I'm not entirely sure what do you mean by this. Do you want to find all recipes that take an item as an ingredient? What would that be useful for?

"Do you want to find all recipes that take an item as an ingredient?"
Yes

I'm building a dynamic station where it a train with any ore can be dropped off and turned into processed ore. Another station can take any processed ore and turn it into pellets.

So if a train shows up with an ore, I want to find all recipes that take in an ore. Yes this will have a lot of recipes that aren't what I want, but it's pretty simple to filter it down to just the ones I do want.

I have some combinators that make my station work now, but I think it'd be a lot simpler and versatile if I could search for recipes based on ingredients.