Came across a nice script for star ratings on CRM 2011 form. CRM 2011: Star Rating Form Control Thanks Carlton Colter for sharing.
My two cents here.
If some other field/logic on the form updates the star rating value, you may want to refresh the iframe with the WebResource and you can do it with the following script
var f = Xrm.Page.ui.controls.get('WebResource_Rating');
f.setSrc(f.getSrc());
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