Here is a coupe more suggestions:

* short frame (joystick/mod wheels ABOVE the keyboard, not on the left)
* externally accessible user interface, to facilitate setup & configuration of ALL the instrument parameters from an external device, e.g. PC. I believe Emu does that with their samplers, allowing connection using the SCSI(?). IMHO, USB would have the sufficient bandwidth to allow both external user interface, AND 2 streams of digital audio.
* breath controller input, to help make more realistic wind sounds. Better still, allow another voice to be selected for when breath controller is active. Gooseneck stand for the breath controller, and a separate one for the microphone.
* integrated, but detacheable speakers.
Regards,
Alex