Just found this open source star rater using jquery, it is called:
RateIt - a jQuery (star) rating plugin
Can be found at this website:
http://rateit.codeplex.com/
I've downloaded two .js files, a css file & related star images but unfortunately I do not know how to implement it in wysiwyg
This is a recently developed script that is billed as being easy to implement (they not meet me before)
The script is highly configurable & would be of great benefit to the community if someone could develop this into an extension.
Hopefully someone can pick up on this.