I can see it saving energy - perfectly sensible - but saving space? I'm not sure I can use that newly liberated space above a fabric fridge, let alone re-organise a kitchen based on squares to fit a cylinder. An interesting concept, but it needs the contemporary kitchen to change shape before it could be sold in a shop.
in answer to my own question - yes, sending extra data arguments by appending them to the URL gives a much more fluid progress bar, ass oppose to adding them to the options.data object. Curious.