1) The movies can be sorted by rating, and a filter is available for top250, but I suppose an additional ratings filter would not be out of the question, its not a priority though.
2) MC gen1 used profiles to achive this, it was just a case of setting up a profile, each of which has their own config, including folders. A drop down menu was used to switch between them. This worked well and it will be one of the things added to gen2 as time allows(TV Shows come first).