12 minutes video description presentation and fix
Make your DNN Standard Desktop DDR Menu Touch Friendly for Mobile and Tablets



based on :
http://osvaldas.info/drop-down-navigation-responsive-and-touch-friendly

The js files to put in a js folder in your skin are in a zip link here

get sure you have the registration then add to you skins files (ascx):
<%@ Register TagPrefix="dnn" Namespace="DotNetNuke.Web.Client.ClientResourceManagement" Assembly="DotNetNuke.Web.Client" %>

<dnn:DnnJsInclude ID="DTTG" runat="server" FilePath="js/doubletaptogo.js" PathNameAlias="SkinPath" />

check your website source to identify the lu li parent div id, set it if needed ex in the latest 720 beta Gravity Boostrap :

<div id="nav" class="nav-collapse collapse pull-right">
                        <dnn:MENU ID="bootstrapNav" MenuStyle="bootstrapNav" runat="server"></dnn:MENU>
</div><!-- END nav-collapse -->

insert at the end of ascx file the call for the id identified :

<script type="text/javascript">
     $(function () {
          $('#nav li:has(ul)').doubleTapToGo();
     });
</script>