@Andreas – nothing. You missed nothing. You cannot define cell height or width with cell styles…
However you can do so with scripting. But not directly in scripting a property of the cell style, but in iterating through all table cells, finding out its cell style and acting on the cell directly (height, minimumHeight, maximumHeight and autoGrow properties).
Another scenario would be using a special plug-in like "Smart Styles" from Woodwing.