If this was for the model with the external button jacks, I'd be all over it. Would be nice if both models were offered with an option at checkout for which one.
conandyThis drop is for both - the natively expandable version is the "-5W" model and is $10 more at checkout. As a few others have noted here, the non -5W still has the solder points for extra buttons, just not the mounting hardware so you'd have to drill through the case to use them.