No idea about the auto download thingie but there is nothing to stop you using your aus account to list on the US site, all you need do is log in using ebay.com and go to the sell form.

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I have tried that with little success. My location shows as Australia and I just don't get the interest, and I suspect, the visability. I don't think it is my product, as I sell well, worldwide, but mainly the US, on other, much smaller sites, but those sites seem to have a more globally inclusive marketing strategy.