the ability to connect circuit wires was added after the mod went live, purely because proxy containers made it possible, the mod's logic therefore has no blueprinting support for circuits (and honestly its just a pain to deal with persisting wires to compound entities in blueprints) so i honestly do not plan to add it, and as for having to fill up their inventory (or just letting it sit idle for a few seconds) that was simply done with performance in mind, encouraging players to fill them up and not have lots of them with low item counts.
i wonder tho, in what way did you misunderstand my mod? i might be able to update the documentation a bit if you're willing to share the difference in thought.