Execute estes comandos na janela do terminal e faça login novamente no sistema para aplicar as configurações:
#increase key repeat speed
defaults write NSGlobalDomain KeyRepeat -int 0
#allow text selection in finder preview
defaults write com.apple.finder QLEnableTextSelection -bool true
#disable "are you sure you want open this application?" dialog
defaults write com.apple.LaunchServices LSQuarantine -bool false