gistfile1.coffee

Cm.GradingSidebarView = Em.View.extend Cm.Shortcuts,
  ...
   
  didInsertElement: ->
    @registerShortcuts [
      { keys: ['shift+up', 'k'], action: 'goToPrevExam' }
      { keys: ['shift+down', 'j'], action: 'goToNextExam' }
      { keys: ['shift+left', 'h', '['], action: 'goToPrevQuestion' }
      { keys: ['shift+right', 'l', ']'], action: 'goToNextQuestion' }

      { keys: 'u', action: 'toggleSkipMarked' }
      { keys: 'f', action: 'toggleQuestionFlag' }
      { keys: 'c', action: 'toggleCommentMode' }
      { keys: 'x', action: 'clearPoints' }
    ], target: 'controller'

  willDestroyElement: ->
    @unregisterShortcuts()
    
  ...

gistfile2.coffee

Cm.CommentTextView = Em.TextArea.extend Cm.Shortcuts,
  ...

  didInsertElement: ->
    @$().focus()
    Em.run.scheduleOnce 'afterRender', =>
      text = @$().val()
      @$().val("").val(text)

    @registerShortcuts [
      { keys: 'shift+enter', action: 'save' }
      { keys: 'esc', action: 'cancel' }
    ], source: @get('element'), ignoreControls: false

  willDestroyElement: ->
    @unregisterShortcuts(source: @get('element'))
  
  ...