I agree with Rasika.... This is something like all or none. If all your devices can't support it, then why do it as it will break things. Also if you don't run it in all your SSID's, why do it just for one. It goes back to, would a person who wanted to access your network, try to access it from a more secure SSID or a lesser secure SSID. Of course it's the lesser. Vendors have features and they have to follow with certain technologies, but as we know, not all vendors devices work well with these new/old features and device manufactures don't always have to follow specifics.