I love Emasc but it can't even do proper full screen. I really wish ST3 has more APIs in the Emacs spirit, but keeping it modern.
(defun full-screen ()
"Indicate to the window manager that this frame should be full screen"
(interactive)
(x-send-client-message nil 0 nil "_NET_WM_STATE" 32 '(2 "_NET_WM_STATE_FULLSCREEN" 0))) (describe-key (kbd "<f11>"))
It is unbound on linux as well (emacs24)