I know I have seen this set on other computers, but I'm uncertain how to change this myself.
Also, I've tried changing bell.png in: ~/Applications/iTerm.app/Contents/Resources/bell.png
However, I'd like to avoid this hack, if this setting can be enabled some other way.
It seems trivial in terminal.app (Preferences->Settings->Advanced->Visual Bell); this flashes the screen in exactly the way I'd like. I just want to do this for iTerm2 instead.