No, I am just using the shoutbox. Turning off mentions isn’t a desirable scenario either. Preferably it would open the shoutbox or if that is not possible, it would take you to a different page. Another solution would be turning off notifications for those mentions but that kind of defeats the purpose. Maybe you should turn them off if there is no better solution.
Also, I wish full page chat could be restricted to certain groups of users like the general one.