Creating Recipes that have nonstandard input ratios

So basically, what I want to do is create recipes where Item 1 is in quantity X, Item 2 is in quantity Y (which may or may not be different from X) and then output Z number of items afterwards. I understand how to change the quantity Z. The problem I'm running into is it seems that recipe generators, and the wiki page on Recipes do not seem to give an option to change the count of items required in the input section and they always default to 1:1. I was wondering if this was possible to do, or if there are any potential workarounds. Thanks!