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This is probably my n.1 annoyance with Factorio.
I will describe the issue through examples and hope someone can help me out.
In certain circumstances (inserters/drones not available) i have to put a specific number of items from my inventory into numerous objects by hand (without opening each individual object inventory).
For example when i want to transfer exactly 15 Ammo Magazines to 20 turrets each.
Or when i want to put exactly 20 Automation Science Packs into each of my 10 laboratories.
So far i have seen that you can transfer either a whole stack or half a stack into an object from your hand by mouse-overing them and doing the ctrl left mouse click or right mouse click.
If i put a specific amount of items into my hand that specific number will be changed to the default full stack as soon as i drop it into the first object (it does not "stick" past the first transfer).
So is there a way of putting an exact numbers of items into the players hand and then easily/rapidly depositing them over multiple objects (labs, turrets...)?