It would be nice to have a command like:
Which brings up an interactive menu that allows you to check or uncheck panes individually for synchronized input.
You can use choose-list for this -- the actual problem will be to make synchronise-panes to be per-pane rather than per-window.
This is an easy thing to do for anyone who hasn't looked at tmux's internals but might want to.
It's also on the TODO list which means when I'm done with what I'm currently working on for tmux, I might pick this up myself if no one else has.
Ticket moved from /p/tmux/feature-requests/97/