C-a still works with readline. You just need to C-a first to 'escape' tmux and then C-a again. Actually just hold ctrl and hit 'a' twice. C-s will suspend the

C-a still works with readline. You just need to C-a first to 'escape' tmux and then C-a again. Actually just hold ctrl and hit 'a' twice. C-s will suspend the terminal on some platforms. (Which can be resumed by C-q.)