Not the OP, but I did riff off of tmuxinator recently. tmuxed talks to tmux directly out-of-band to avoid running over user input and supports things like "wait before sending more input" for cases where `sleep` isn't desirable. I envisioned it being an orchestrator layer over tmux rather than a "new thing" to learn; while it's largely finished for my normal use cases I've been thinking about how sometimes it'd be awfully useful to be able to orchestrate tmux commands and not just send-keys.

Single binary, too, so no Ruby dependency. I really should get it into Homebrew one of these days...

https://github.com/eropple/tmuxed