Well, if they would have added those keys, the KMA would have given both T4 and PA3X a run for their money.... Cant imagine anyone spending $4000 dollar on an arranger if they can have almost the same for $500.
(Sorry Ian, but i could not resist the urge)
Almost the same?
Ha ha!
Thankfully we don't hear things with the same ears.

The KMA sounds okay for
10 year old technology, but, one would be silly to even try and compare it to a slinky PA3X, let alone the mighty Tyros4.
But, there will be those who dare.

Ian