Shiral,
Actually even though I am a Tyros fan now.....when I had my PA you can do what you are saying you can't.
With the PA you can hit one key and have the accmp. stop and just the drums playing or everything stop and either can start again by playing a chord as I recall...
I'm drawing from old memory here, so one of you PA owners help me out. There is a velocity setting seems to me on page 25 or 27 and by using this setting it gives you the options I just mentioned. Bottom of the page......chip in here someone, look at the screen that has the 20 something pages on it and look for the velocity settings.
Something that is kind of cool about the PA fills (though I think they suck in general) is that if you hit a fill 2x's quickly, it will stay on that fill and give you a long drum fill.
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jam on,
Terry
http://imjazzed.homestead.com/Index.html