One thing that would be awesome is that while it’s awesome to be able to close the sidebar to make things full-screen, it’s utility is largely useless due to the inability to cycle through files using a keyboard shortcut. With a keyboard shortcut, then someone (me) can keep the sidebar closed anywhere between 60-80% of the time resulting in productivity gains and just that simple feeling of convenience we get when things run smoothly.
I hope this feature comes out soon as I have no doubt it’s already being considered and built into the roadmap.
FYI. Plunker has this feature and while their UI is blah, this feature has kept me relatively loyal for a while now.