I don't know about the iPhone, but in my experience the Crestron App scales the iPad interface down if you try to use a custom high resolution on newer iPads with retina screens, so your high res interface you worked hard on ends up getting squished and messed up in odd ways and looking like hot garbage until you spend 2 hours scaling it all back down to the standard resolution the VT Pro project supports. I would caution you against using a custom resolution to build an interface until you've tested that elements scale appropriately. I learned this the hard way.
-Stuart
