If I remember correctly from the developer list, the way OS X does it (gradient zooming) can't be implemented.
Reason: surprise, surprise, Apple has a patent on it
Well, in *my* opinion, the old Kicker effect (Icon just changes for a bigger one at mouseover) is cooler than the OS X effect (Icon gets gradually bigger as the mouse-cursor approaches).
So, if the former effect would be implemented somehow, returning the kde 3.3 style, no Apple patent would be broken, right? :)
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