Currently we have the nice option to replicate what we type in one of more tabs. This is great when someone wants to enter the same commands in more than one or 2 machines. 

There are use-cases where cloning or synchronization is useful too. Like when you want to share your screen or just an application in a video conference and you don't want to share the rest of your tabs, or simply because you want to use a graphical tablet and annotate while you keep the konsole in your main screen. 

What I would be interested to see is a functionality where a tab is fully synchronized/mirrored to another tab. So, not only the commands I type are sent to the other tab, but any output from the CLI as well. 

A relevant functionality is already implemented in Kate with the "New Synchronized Window" under the file menu.