I do most of my work from within a single tmux session, so this isn't super useful for me. However, I heavily use tmuxifier [1] which I've extended with some custom shell scripts which further enhance my workflow.

Instead of launching tmux with a predefined session configuration, I launch a fresh session and then use tmuxifier to load window configurations as needed.

A large benefit of tmuxifier is that it's all written as a collection of shell scripts, so there are no additional dependencies. It also has really good tab completion.

1: https://github.com/jimeh/tmuxifier