Add the ability / preset to add custom crafting UI's that works with the built in Recipe preset, if possible

There is a chance this may have been suggested already, but looking I never saw anything soo..

I personally think it would be convenient for modders, and would allow for more flexibility with what they make.
A basic explanation is that when you make a block, you can set up a UI for it that is counted as something that will have recipes on it, such as a custom crafting table for example. Once you attach that UI to a block, creating a Recipe preset will allow you to set up the recipe using the custom crafting UI instead of the base minecraft recipe-using blocks