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Upgrading to Lion or Yosemite and WebStorm 9, I noticed key repeat was
turned off for the IdeaVim plugin h j k l keys.

System-wide key repeat

defaults write -g ApplePressAndHoldEnabled -bool false in a terminal will enable
key repeat for every app. This can alternatively be found in the accessibility settings in OS X' preferences.

App specific key repeat

If you only want this behavior for specific JetBrains' apps, use:

• Community Edition IntelliJ: - defaults write com.jetbrains.intellij.ce ApplePressAndHoldEnabled -bool false
• Ultimate Edition IntelliJ: defaults write com.jetbrains.intellij ApplePressAndHoldEnabled -bool false
• AppCode: defaults write com.jetbrains.AppCode ApplePressAndHoldEnabled -bool false
• PyCharm: defaults write com.jetbrains.PyCharm ApplePressAndHoldEnabled -bool false
• Android Studio: defaults write com.google.android.studio ApplePressAndHoldEnabled -bool false
• WebStorm: defaults write com.jetbrains.WebStorm ApplePressAndHoldEnabled -bool false *
• RubyMine: defaults write com.jetbrains.RubyMine ApplePressAndHoldEnabled -bool false *

** * These are assumptions, use Spotlight com.jetbrains. to get type hinting for your specific app**