You can set the integer field the widget maps to to any value between 1 and 5 by clicking on the appropriate image. If you have clicked on rating 5, then you are able to subsequently click on, say, rating 2 and it will decrement the score to 2. What is your issue?
Can someone please shade some more light on this because i would like to implement a voting criterion but i dont know how to approach it though i have the widget with me.