I'm afraid you are mistaken there MortAr-
Many of Blizzards default max and mins can be ignored by holding shift before accessing the value. This is a great way to mod many elements of the game. These defaults were put in so noobs dont make their games crash.
For instance I can tell an icon to be placed in slot (-1, 0). I can make the world editor accept this, but if the game ever tries to display this icon, it will crash.