It would be nice with the ability to disable WebRTC in the settings, this way VPN users have an easy way of protecting themselves against IP leaks and those who want to use WebRTC reliant services may continue to do so (as opposed to if the feature was removed completely)
Many users may find extensions like ScriptSafe bothersome and it has apparently been revealed that the WebRTC Block extension can be bypassed with an iframe.
[b]Update[/b]: The WebRTC block extension is not 100% effective and can be bypassed with an iframe. The check page was updated to reveal this.