I was just thinking of a nice idea of each user also having upload/download ratio which is an interesting statistic also, especially to have rankings on. It shouldn’t be difficult to implement either.
Wopian made a third-party tool with a similar feature. Besides lots of other cool stats, it shows you your Keys:Clicks and Download:Upload ratios. Check it out here.
I dunno about leaderboards for ratios, though. That’d be too easy to manipulate.