Allow users on mobile devices to click through menu items, on menu item is touched a class is added assuring the next click will be allowed to perform its behaviour.

jquery.touchstart.allow_second_click.js

jQuery(document).ready(function($){
  /**
   * Allow users on mobile devices to click through menu items, on menu item is touched 
   * a class is added assuring the next click will be allowed to perform its behaviour.
   */
  $('#menu-fsa-navigation li.menu-item-has-children > a').on({ 'touchstart' : function(e){ 
  	var $this = $(this),
  			next = $this.next('ul.sub-menu');
  
  	if (next.length) {
  		if (!next.hasClass('clicked')) {
  			e.preventDefault();
  			next.addClass('clicked');
  		}
  	}
  }});
});