OK... here's another one...

Why not have a 'clone' MIDI setting, especially for Yamaha PSR range and others that have very light, 61 note keyboards. You plug ANY MIDI keyboard into it, send to it on ONE MIDI channel, and it reads the external controller as if it was still reading it's own, actual keyboard. Splits, Layers, Chord recognition, controllers (pitchbend, mod and sustain and expression, at the least), ...everything.

That way you could buy a nice 76 or 88, set it to send on just one channel (nice and simple!), and set the PSR on it SO close (you don't need to access the 76's display or knobs) that it is still relatively easy to get to the PSR's variation buttons, etc..

Even better would be that once 'clone mode' was engaged, it might free up the PSR's keyboard to be assigned to a sound of your choice, maybe for the organ sounds.

Kurzweil K2500 has this very feature... no matter HOW complicated a split and layer scheme you use, if you connect another MIDI keyboard to it and activate the mirror function, it re-routes the one MIDI channel coming in to whatever sounds the real keyboard would play.

This might be a great boon to those who like Yamaha arrangers, but can't stand the action...