Last weekend I had some time to play around with R3. Beside some bugs and crashes (will report them later, with all traces, etc) we found one thing really annoying.
Clips are not automatically scaled to the (current) composition size.
It's really a pain to add footage during the show.
I think it would also help when preparing decks offline, if the clips are automatically scaled. However I'm aware of the problem, that the size of a composition can change later on, and that might makes troubles too.
Did others run into this "resizing" problem