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Hello Chang,
thanks for asking.
A valid point. Remote Buddy does, however, not recognize Exposé being 
active yet. In fact, I'm not sure whether this is possible since it 
sits at such a low level. But now that I know about the request, I've 
added it to the ToDo list and will investigate. I already have an 
idea at my hand, though :-)
Right now, to use Exposé, you'll have to explicitly choose the Exposé 
behaviour.
Best regards, 
Felix