Hi, Larksong. I have both Reader Library and calibre installed on my Mac.
There is a preference in Reader Library that you can set so that it doesn't automatically launch Reader Library when you plug your Sony into your computer via USB. I highly recommend turning off the autolaunch.
You can use the Reader Library software without having your ereader attached via USB. So you could purchase whatever books you want from the Sony ebookstore and download them to your computer. You can then import them into your calibre library and use calibre to send them to your 505 just like you are used to doing.
In other words, it is possible to use Reader Library without ever having it scan or see your 505 if you are worried about that. Just turn off "autolaunch" in preferences and don't attach your 505 via USB when Reader Library is open.
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