Apart from the difficulty of making this robust across platforms, I would feel uncomfortable with an application changing permissions of files. This is treading in murky waters and means changes to the system that aren't expected.
Also, I can guarantee that there is someone out there relying on this behaviour. Someone is putting read-only files in the auto add directory knowing that they won't be processed immediately. I have no idea why they are doing this, but I am sure that someone is.
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