Mac OS X iTerm2, tmux and jump word

Currently I'm working on a MacBook. Not entirely by choice, however.

I'm trying to use my almost used environment, including tmux. As Terminal replacement I'm using iTerm2, since it seems to be faster. Unfortunately I was not able to use ALT-[left|right] to jump words backward and forward. The only thing I had to do to solve this... capturing the sequences of ALT-left and ALT-right and place them into ~/.inputrc

# Press ALT-left

$ read
^[^[[D
# and ALT-right
$ read
^[^[[C
$ vi ~/.inputrc
"\e\e[D": backward-word
"\e\e[C": forward-word

And open an new instance of iTerm2.