I used to use Byobu heavily as a friendlier interface for tmux – it adds some useful features, but I found it a bit too heavy and complex for my admittedly-simple needs. I moved on to a customised tmux.conf, but found myself missing the status bar widgets. I tried a few tmux addons, but didn’t want one that was going to run comparatively-heavy Python code every time the status bar refreshes. In the proud tradition of stubborn assholes being unsatisfied with current solutions, I wrote my own: fmux - the Function-key enabled terminal MUltipleXer enhancement.
Toggleable F-key shortcuts for window creation and management
Easy shortcuts for splitting panes
Extensible statusbar widgets generated using a bash script
See the repository on GitHub for source code and installation instructions.