A logistic request for 0 of an item triggers (incorrectly) a "Any Planet Import Zero" condition. So since the request is 0, the item is not requested, therefore the platform is stuck in an interrupt loop

Great suggestion! Adding to that: ctrl-drag could copy the signal (would help a ton for creating many similar signals, when dealing with quality). Another suggestion on this topic: when you click on a signal recipe/item the focus could go directly to the constant number box, so that we dont have to ...