if you root it, you can add apps that have been developed for it. there aren't alot though. the main reason people root is for the library app which combines your b&n books and the books you sideload (the stock library app doesn't do this, it separates them). Also there are apps like Trook which you can use to connect to your Calibre server to download books from your computer's ebook collection.
not sure what you mean by system configuration? I *think* there was a way to change fonts, etc, but didn't really look into it.
You can use it unregistered, but i believe the new "shelves" feature in firmware 1.5 requires registering or your shelves won't save after a reboot.
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