If I understand your need correctly, I believe it's solvable. Admittedly - using hacks, etc as you speculate. But in case you're interested in a solution that's

If I understand your need correctly, I believe it's solvable. Admittedly - using hacks, etc as you speculate. But in case you're interested in a solution that's bundled up - please have a look here and see if it sorts you out: songseed.org/exhibit/20140430/tmux.launcher.sh If you want to use the default, just do 'tmx'. If you want to have multiple windows, themselves shared between multiple terminals, use a label when you use it. e.g. 'tmx second'. One thing you might find frustrating is that it resizes all the terminals for the screen size of the smallest. If anyone knows a fix for this, please supply.