Make smart inserters read from blueprints

[hitzu]

Many of us build very standart outposts using blueprints and load all the needed stuff in trains, sometimes in a car, but equipping the train with all the stuff in required quantities sometimes is tiresome - you have to manually count or estimate the amount of items you'll need and then manually load the train or manually set the filters.
I think it would be very useful if smart inserters could read signals from circuit network and load only the amount of different items that they recieve via wires.
In the same time it would be great if smart chests with ready blueprints in them instead of a "blueprint" signal would output the signal of all items contained in these blueprints.

What do you think?