No. The form tag will ultimately get translated into an HTTP POST request routed to the
JSF dispatcher
servlet. And, of course, when you do HTTP POST, the entire form's data gets sent, not just a single item.
However check the JSF button tag docs. I'm pretty certain that I
have done forms with multiple buttons where I did actions based on which button was clicked.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.