I love this idea - I've wanted something like this for a long time. When playing new games I'd like to actually be able to see what real scores others are coming up with. It will be nice to have a spread of scores to see where you rank. This is a nice alternative to being made painfully aware that you aren't in the top 3 of a particular machine...
Of course the settings will probably have to be noted somehow. For instance, on my Flash I've changed the "Super Flash" to score an extra ball instead of a free-game...as all my games are free... I'm not sure how you really note something like that, is it something that would even be eligible?
Either way, I look forward to seeing this take shape. I'd be happy to post my meager scores to keep the average down.