I have run into this situation many times while performing live with the PSR-3000.
It seems the biggest problem facing traditional piano players with an arranger, is learning how to play chords in a more restricted area of the keyboard(when using split keybd)and keeping the hand still during performance.
Also "playing" the sounds in the style of the the instrument selected, rather than in a pianistic fashion, is sometimes an issue.
Synth and organ players seem to have less trouble wrapping their minds(and fingers) around the arranger use.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.