I'd like to see the option of setting up a playlist within the iOS app. My primary use case for upgrading to a Roamio was to be able to fill up an ipad with shows for my toddler to use on road trips. It would be nice to be able to queue up a number of these 30-minute kids' shows and get several hours of playback, rather than selecting individual shows and hitting play. (This feature is also maddeningly absent from apple's own "videos" app.)
Also, are there legal/licensing issues behind the lack of AirPlay support in the iOS app? It would be handy to stream shows from the tivo app to the appleTV at our destination.