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I think we can (by now) override the "PDA iD" for a little by using something as simple and lazy as a subdomain redirection. But obviously would be nice to have such feature and be able to give away the same URL to any one without worries of the browsing methods/devices.
But I'm still thinking about adapting a theme to have it plain and simple enough to work with a PDA browser. And probably it would be easier to get that theme (build it) and code a module that switched to that theme in case we accessed by an specific URL or from an specific browser (PDA iD).