Fullscreen on startup would be handy for stand-alones. Quartz Builder comes to mind, the way it gave you a couple of options like this.
(Mockup by Team Vuo.)
The proposed changes allow you to set the fullscreen status and other properties for a window.
windowProperties input port would be added to nodes that display a graphics window (
Render Image to Window,
Render Layers to Window,
Render Scene to Window).
Change Fullscreen Status node can be connected to this input port's drawer, allowing you to make the window fullscreen when the composition starts (or anytime while the composition is running).
Other nodes, such as the proposed
Change Window Position and
Change Window Size nodes, can also be connected to this input port's drawer, allowing you to change other window properties in the same way.
We chose to provide separate nodes for each window property, rather than a single node for all window properties, so that each window property can be changed independently without affecting others. For example, if a Vuo composition displays a window, and the user of the composition resizes the window, then a node such as
Change Window Position or
Change Window Title could alter the window without resetting its size.