New Twiddle

components.shift-click.js

import Ember from 'ember';

export default Ember.Component.extend({
  click(e){
    console.log('clicked')
    if(e.shiftKey){
      console.log('clicked with shift')
      this.sendAction('action') 
    }
  }
});

components.test-component.js

import Ember from 'ember';

import shiftClick from '../mixins/shift-click'

export default Ember.Component.extend(shiftClick,{
  action: 'test'
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {

  }
});

mixins.shift-click.js

import Ember from 'ember';

export default Ember.Mixin.create({
  click(e){
    console.log('clicked')
    if(e.shiftKey){
      console.log('clicked with shift')
      this.sendAction('action') 
    }
  }

}); 

templates.application.hbs

{{#shift-click}}
	hey
{{/shift-click}}
{{#test-component}}
hey
{{/test-component}}

templates.components.shift-click.hbs

{{yield}}

templates.components.test-component.hbs

{{yield}}

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.4.4",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "2.4.4"
  }
}