Goonhub
The general idea is: If there's an item on the ground, on your body, or in your hand and you shift+click the item with a storage inventory open (i.e. backpack, toolbox, toolbelt, box, etc.) the item will automatically enter the inventory without having to make two unintuitive clicks.
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Just in case there's an item that would be too abusable to shift+click into a storage item, there could always be a few blacklisted items that have delays.
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Just in case there's an item that would be too abusable to shift+click into a storage item, there could always be a few blacklisted items that have delays.