Disabling Right Mouse Click on FACEBOOK UNITY SDK

Hello,

We are trying to update our facebook game to use the new Unity Facebook SDK, however we stumbled on a serious problem :

Since we have no control over the HTML/JS that surrounds the web player and the initialization of the web player we can't disable the context menu, and since our game relies on Right Mouse button for some actions and locking the cursor isn't an option ( 2D shooter where the player uses the mouse to aim ) we're kinda on a tight spot right now.

Any of you guys managed to disable the context menu in a facebook game using the new SDK? If so, how did you do it?

Regards,