Currently that is a hard coded limitation that isn't going to be an easy fix, unfortunately. When I first released the plugin, the idea was to allow all ingredients to be wildcards, but it turned out that there was a fatal flaw in my logic at the time, and the only way to get a fast update our the door was to only allow one wildcard ingredient.
I have plans to eventually restore that functionality, but I can't give a time line, as it is likely to require another complete overhaul of the way that recipes are detected.