Nigel, sounds good except that I could forsee this problem. A combination device such as you describe would (necessarily) cost at least 1/3 more and many arranger players might not want to pay a premium for features they will never use (particularly home players) and vise versa. Also, as long as it has full-featured arranger features, it is GOING to be viewed as an arranger (with all the baggage that is attatched to that label). Look at the PA3x; very close to being a full featured WS but probably not purchased by any 'pure' synth/WS players. Still, as you said, it's probably the only viable solution. But first it (arrangers) will have to overcome the stigma it has with younger players.
chas
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"Faith means not wanting to know what is true." [Nietzsche]