What my link is meant to show is that even if such a law is introduced, chances are it'll be overturned. Since the initial decision, the court has only expanded speech in terms of burning or other physical destruction.

Plus, at least in the US, people are a lot more easy to rile up over American Flags that Qurans. It'd be a lot harder for any bill to pass about protecting Muslim holy books than the flag. I'm not saying that as a good thing, just as a point of fact.