0.10.0 - phones, and taking turns at the keyboard
Two things that only show up once more than one person, or more than one kind of device, is involved.
Touch mode. A phone has no pointer to map, so pretending it does makes the console unusable. On a touch screen the picture is now a trackpad: one finger moves the pointer, a tap is a left click, two fingers tapped is a right click, two fingers dragged scrolls, and a long press then drag holds the button down. An on-screen keyboard types through the target's own layout, the way paste already did. It turns itself on when the browser reports a coarse pointer, and there is a Touch button if it guesses wrong.
One driver at a time. Before this, every new viewer silently took the keyboard from whoever had it, and the person who lost it had no idea. Now the first client holds control and keeps it. A second viewer sees a banner saying somebody else is driving, with a "Take control" button. Taking control demotes the previous holder to a viewer rather than throwing them out, so they keep watching and can ask for it back.