Out of curiosity iTerm or iTerm2? If the latter what is crap about it?
I have one huge gripe that I haven't been able to fix but its not that huge a deal. Every so often the terminal will lose its mind and start displaying mouse escape sequences. Nothing resets it out of this state, have to close whatever window I have open and start anew. Not a huge deal due to tmux but annoying enough to frustrate.
I have a toggle to turn it on off in my tmux.conf, have a looky: https://github.com/mitchty/src/blob/master/dotfiles/tmux.con...