It would be nice if it would be possible to see at your player page what your highest rating ever was in a certain game (and perhaps when you had that rating). It would also be great if there would not only be a list of the highest rating players at this moment at the game page but also a list of highest rating players historically, which shows their highest rating ever.
Since we're speaking of changes and the rating chart, I would rather see my rating plotted not against TIME but simply against the number of games played. Plotting your rating progress against games played would avoid the long horizontal line that you see on your chart when you take a break from the server for a few months.