According to the tmux(1) man page, unbind-key -a is what you are looking for.
Note that tmux runs a server that will only exit once all sessions are closed, and the key-bindings are per-server. Hence once you create a binding, it will be persistent over all client detaches.
That said, put unbind-key -a at the very top of your configuration file, and on config reload it should do what you want - unbind everything and start binding from scratch. Or - if your modifications are smaller - unbind only what you want to change.
Xfce provides a way to disable the key binding from the Settings Editor.
This will work only for GTK+ 2 applications, given that "gtk-menu-bar-accel" has been deprecated in GTK+ 3 (since version 3.10). As a result, user might have no choice but to disable the key binding per application, which may also depend on which toolkit in use.
Go to Applications Menu > Settings > Settings Editor. Xfce 4.10 or newer provides another way to access by Settings Manager > Other - Settings Editor.
In the Settings Editor:
- On the left, under "Channel", scroll down and select "xsettings"
- On the right, under "Property | Type | Locked | Value", look for Gtk > MenuBarAccel
- Double-click on the row of "MenuBarAccel" to edit this property
- In the "Edit Property" dialog, delete the value
F10 (leave it blank) and click Save.
The final step will disable the key binding for activating the menu bar.
Custom keys: User can also change the key binding to something else. For example, changing the value to <Control>F12 will re-map to Ctrl+F12 key combination to activate the menu. Try with any key bindings using <Alt> <Shift> and other keys. More clues are found under "Channel: xfce4-keyboard-shortcuts" and under "Property".
Restore to default: In the Settings Editor, click Reset button that is located at the right-most icon, either at near-bottom of window (Xfce 4.10 or newer) or, on top of "Property" column (Xfce 4.8).
Precaution (Xfce 4.8): In older Xfce, clicking Reset button will cause the entire row of "MenuBarAccel" to be removed at all. To avoid this, double-click on the row again and change the value to F10 to restore.
Name: /Gtk/MenuBarAccel
Type: String
Value: F10
In case user have accidentally deleted the property, create again the property as follows. Click New and re-register the property in the "New Property" dialog with the settings quoted as above.
Xfce can still disable the key binding for GTK+ 2 applications, such as Orage and Xournal. Given that many applications are now GTK+ 3, the setting will be less and less relevent in newer Xfce.
Best Answer
You can use
send-keys:C-his not a key used by tmux by default (precisely so you don't need to do this).If you are running 3.1 or master you could try something like this to make a key which sends the next key: