Moneya, what type of App is your users requesting?

If your site is already fully responsive and all they need is access to the site, couldn't you provide them with a very simple Button type App which they can easily load on their phone and click on to make it easier to go directly to your already responsive site?

Please visit my app building framework at http://engap.org/   this framework is build using phonegap, and angularjs.  you can quickly build your app out of your ELGG site.