we don't have parity with tmux yet. in terms of scripting and screen splitting, tmux is better. but, we will get there for most of the features, and i hope we'll be able to deliver those features in a more user-friendly and accessible way to non-power users. by using web tech, we know it is (relatively) easy and possible.

imo, building these types of features into your terminal make a lot more sense than having them run on every remote machine. ever run tmux inside of tmux?