1 - yes
2 - don't worry about this. peer review will catch any animation issues. actually the animation part of charting is really really simple and easy to use.
3 - yes
4 - RBN dlc has a different icon / category. RBN dlc and regular dlc are separate entities.
also for the curious, authoring cameras / lighting is completely optional. If you don't author the camera and lighting it will be auto-generated for you. I personally love doing the camera and lighting chart. gives the songs that personal touch.