Describe the suggestion
Actually there are several items displayed in JEI which don't have a vanilla recipe. I would appreciate if those get hidden.

Also rendering of all the models might create FPS drop on slow machines

Here's an small example how to hide Items from JEI
https://github.com/PC-Logix/OpenSecurity/blob/c837bc053b62a382bb3d36ec867d56b2a0825a66/src/main/java/pcl/opensecurity/client/jei/JEI_Plugin.java#L52-L54

But for some big mod like IR i would suggest some actual Handler where Content creators of addon packs can opt in their items from being hidden.

This could possibly also be bound to a config option so that players can chose if they want the items to be displayed or not

At some point we will be attempting to add JEI integration so the parts will have an actual recipe.

there's a mod that does that for you:
https://www.curseforge.com/minecraft/mc-mods/jei-hider

Thanks, JEI also offers some way to hide ingredients on its own, but not everyone is aware of that, and not all IR Items can be selected for some reason.