Facebook SDK: Post scores without publish_actions or another alternative?

I am using the Facebook SDK Score system to post the scores that the users have on my game.

However, to do so, the users must approve the publish_actions request (which pretty much nobody does :P).

I have seen lots of other games that keep scores without requesting publish_actions.

How can I do it?? Or at least modify the message that publish_actions gives to the user (to say that I only want to post the scores to the servers and not to their timeline)

(the game is made with Unity 3D 4.6)