I have tmux command key as C-a. C-Left/C-Right to jump between words (or whatever it is called) works just fine in urxvt alone, but under urxvt/tmux it'll print '5D' and '5C' for Left/Right respectively. How do I configure tmux so word skipping works (either with on X with urxvt or in a tty)?
I guess you'd need to do that in each programs and change their key bindings.
I don't know why tmux mangles the keystrokes going through though.