Long ago, there was an idea that you could pin recipes to the edges and corners of your screen, where they would remain as a semitransparent HUD element. The ultimate idea was that you would be able to click on it to pick up a ghostly copy, then "stamp" that copy to transfer items, with a quantity varying with left/right click and whether shift was held.
The idea was to generalize it so that you could put patterns into chests, or the side of your inventory that Factorization's pocket crafting table used, or directly into crafting tables as usual. You also would be able to have a "TODO HUD", as a reminder of what you were working towards.
Obviously, I never got around to that feature, but there is a tiny piece of code, still lingering around from 2012, that just barely hints at it.