Diki, I imagine it's been thought of...I know I'd like to see it as well, and I'm sure I'm not the only one, clinician or otherwise, who has requested this feature.
The Mega Voices seem to lend themselves better for use in styles...Yamaha is always introducing new ones...I noticed a new Mega Voice Saxophone in the S900/S910, as well as the Tyros.
The control over the Mega and SA is different, I'm told.
Maybe the Tyros4 will have them in the styles.
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.