Prevent node's author to vote on his node

Hello,
We're using jRating module, which works well, but our customer wanted to add this rule : "an author wan't rate his own nodes".
Attached is the patch we made from our modification.
We simply added administration options which allow to choose to not display the jRating form to the user, if he is the author of the node.
What do you think of this modification?

Thank you for your feedback,
David