0.A full screen works, I’ve used it. I’m pretty sure the current experimental works too, i’m using one from a week ago and it’s full screen works too.
If you switch to full screen and when you try to start the game nothing happens then you have the TERMINAL_X or TERMINAL_Y variable set higher than your monitor can support. Go into config.txt and change them to half their current value, then slowly bump them up until you have the entire screen filled without going over.