I don't see the lack of a double screen being an issue considering the majority of DS games wasted the bottom screen anyway, could it not just be made to emulate(or more to the point, port) the games where only the top screen is required, would love to have Zoo Keeper on the Pandora for example(none of the clones have been as good IMO) B) .
Of course I have no idea if it's possible to emulate the top screen only, perhaps it isn't which I guess would throw a real spanner in the works.