But Mintyy, surely you know if you've got a parcel due to be delivered - just like your inconsiderate neighbours do. So unless you've got a parcel due, why not just ignore the door if you're busy?
And if you're working and don't want to be disturbed by answering the door, I don't get why you'd be happy for a friend to drop by.
Like I said, I'd much prefer delivery companies either left notes for redelivery/depot collection or left the parcel in my garden. But some see it as an absolute last resort, and so my neighbours get bothered.