The basics are here, but it needs more than that, like the ability to set the startup view for mobile, from the device. The overall simplicity from the user perspective is a major aspect behind Zendesks success, so I see extending the basic usage features to mobile as expected. Mobile is the new web, so your mobile interface should be treated as a first class citizen, not just a cute bone to throw to your customers. I love Zendesk, so I would like to see the mobile app reflect all of the goodness that is Zendesk :-)