About the click I am thinking that like in every view, click can be useful. for example when the AsRatingBar is not editable by a click I can jump to see the details of a rating.
About the CurrentRating: it contains the actual rating. I was talking about the parameter to define the max value (that in the designer is shown with that strange "Int Example" like the minimum value). Without these parameters it is not possible to create an ASRatingBar programmatically.