I do not think given the nature of a review system we would allow at this time people to make another review thats why they can edit there original review if they change there mind. It has been this way forever.
Code:
Content visible to verified customers only.
Now if I try and type the same message in quick reply it stops me. If the message is different it doesnt. My take on this is if they have already rated or reviewed they should not be able to review again but change there initial review. I assume if enough users feel strongly the other way we can change it but for now the fix would be this.
Code:
Content visible to verified customers only.