This would be nice, but really means a serious change in the nature of the plan view. It would need to become a true 3D view of the model. I suppose that these features could be hacked onto the existing plan view, but that does not seem worth it.
You can do pretty much what you are looking for now by generating a plan section in 3D and using it as a background on your layout to be overlaid with your floor plan drawing and/or 2D notes, etc.