Since my suggestion about resizing the item list panel was handled so well, I have another suggestion.

I'm not sure if there aren't some technical limits because it's something that i felt was always missing: the possibility to filter the recipes within the same "machine" tab.

This can be very helpful especially with GT types mods where for example a tool has many, many pages of recipes to cover all the different materials (and sometimes variations of the recipe). It's not easy to parse. It would be great if there was another search field so that you could narrow that recipe list (both input and output) to what you type there. So that I could search for a "hammer" the usual way, see all the possible recipes, and then type "bronze" in another custom search field to have NEI show up only the bronze recipe, if there is one.

It's also a way to quickly verify that one specific material can be used, or to search for specific processes.

I also noticed that in other JEI versions, if you click on the title bar you jump to the generic recipe list of that machine. So that you can see all the recipes for a particular machine. Having the custom search field could also be used here to better refine searches right from the machine tab, and it could be more powerful than going through the item list (for example searching for two materials, if I type "iron & bronze", for example, or whatever the syntax for "or").