Unfortunately no. Many med/bio publications are subscription only. To do something like paperscape, you would need a massive corpus of papers, which would really cost a lot. Pubmed only has abstracts, not the citations from the paper.
That's true, but coverage of seminal papers is not that great in Pubmed central from my experience. This may change now that there is a push for all publicly funded research to become open access immediately or after 1 or 2 years.
Thanks for the link. We will look into the Pubmed data and see if any of it can be included in the map.