Broadcasting to workspace
I would like to broadcast my input to multiple windows at the same time. Let say to whole workspace. So basically I type in a command like ssh some-outside-host.com -luser and then all my windows inside current workspace will fire up ssh and connect to that outside host. Basically I would like a similar functionality as broadcasting in terminator.
This is not possible with i3. If your primary concern is SSH, you may want to have a look at Cluster SSH (cssh). cssh opens a terminal to each host given, you can give the same host multiple times. Input can then go to all terminals or just a subset. You can also use each terminal on its own.
And I'm confident that we wouldn't provide such functionality in i3 as it would be a complete hack of the X specification which clearly only wants one window at a time to have the input focus.