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I really want to be able, once configured, to be able to simply power on my RR and stream internet radio...nothing more...

While this is in theory possible -- as long as the Receiver is only "switched off" using its own power button and not unplugged or rebooted -- I haven't seen it as a feature of any of the Receiver rewrites I know of.

(Tony is correct that once the Receiver has lost power completely, it needs to be restarted using a computer. But that should hopefully be a rare occurrence.)

Not that it's much use to you now you've bought the Receiver, but Roku Soundbridge has the behaviour you're looking for.

Peter