There is the 3 width sizes on the upper right hand side of the browser? something like this >ll<
If only in full screen the no AFAIK.
Yes indeed. I was looking for something larger, like what you get setting youtube vid to full screen, which is larger than Go's large. I think Oculus is trying to limit power use, but who knows. It's something Oculus could change with an update. I use a battery pack taped to the top strap for extra endurance. So far no heat issues.
i7-5820K @ 4.2Ghz, water cooled, Asus X99-Pro USB 3.1, 48 Gb DDR4 2400, Samsung 950 pro M.2 SSD, GTX 980 Ti SC, 750w psu