What strikes me as kind of odd is WHY did Korg shorten the keys at all? Those plastic keys weigh next to nothing, therefore weight would not be an issue if they were full width and length. To me it makes absolutely no sense at all. Lets be realistic, another 1.5 inches in key length may add a quarter-pound to the total weight of the keyboard, which would be insignificant at best.
Cheers,
Gary