Can you specify what resolution you download for movies and tv shows are for the iPad? i.e. 720p vs 1080p? I know on my Macbook I can specify the resolution of movies from iTunes but can you do this on the iPad and if not what resolution do they download onto the iPad if you use iTunes on iPad to directly download them? Ideally I would like to have the lesser resolution so I can put as many movies on the iPad for my kids when we travel.