Reenabling Key Repeats in OSX Yosemite
Apple has disabled key repeats by default in Yosemite. To enable, just run:
defaults write -g ApplePressAndHoldEnabled -bool false
In case you don’t like the delay with key repeats, you can remove it by running:
defaults write NSGlobalDomain KeyRepeat -int 0
and of course disable the annoying spell checker
defaults write NSGlobalDomain NSAutomaticSpellingCorrectionEnabled -bool false