I believe from the comments on the mod there was a suggestion about a GUI for item factories. I'll add a button that opens up this GUI in the editor menu.

I've just released v1.11.0, which adds this! In the top right corner of all item factory guis (+ the nbt editor and container menu), there is now a factory icon which opens a list of all the item factories with guis. Additionally, the keybind Shift + Space will open this gui just like the Space and Ctrl + Space keybinds.