Issue with ratings

I am having a little issue with the ratings – it’s all too easy to click 1 star before you realise that you have to hover over 5 if you want to rate something excellent instead of clicking each star. This has resulted in a few people giving something a 1 star rating by mistake and there doesn’t seem to be any way of them being able to amend the rating once clicked.

So my question is, either:
Is there a way of amending the rating once clicked?
or, failing that, how can I turn the ratings off all together?

Thanks LJ