I can confirm that the background picture doesn't show on startup in the development version - we'll try to get it fixed.
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While I do have a Raspberry Pi myself, I've never used it like that, so I'm afraid I can't help you with that. You'll probably have more luck in the official Raspberry Pi website forums.
An alternative setup could be to use only 1 monitor where the output (lyrics/text/etc) is shown and then use web-remote or android app for remote control.