That's a good question.. We don't have an option to automatically add it, and unfortunately, we don't have an easy tag for it either (though thinking we should).
However, if you want to add it, we can get you some code to do it. I'll have to look into the best way to do it so that it checks if the user already has connected first and then show the button only if they haven't. Just let me know if that interests you.
Thanks,
Alex