When driving multiple displays or projectors one needs to be able to enter fullscreen on multiple windows or fullscreen with a window that spans displays. This doesn't seem possible at least with Mac OSX. See attached screen shots, one window for each display but fails when entering fullscreen using fullscreen window tab at least. This is a fairly common thing for me on large multiple projectors, split a high resolution movie across displays/projectors. Trying now with change fullscreen window properties but without luck.