First off, I know nothing of programming so I am both unable to do this myself and unaware of the time costs to implement this.
That being said, one thing that has always intrigued me is player winning percentage in regards to the various end-game conditions. Those conditions being Province, Colony, and 3-Pile. I've always had a suspicion that 3-Pile is my specialty, but I have no numerical way to back this up. I think this would be a neat addition to the already awesome player pages.