That'd be a pretty cool idea. Though I think for me I'd prefer something that kills off the test if I drop below a certain speed. Accuracy isn't a huge issue once you start getting faster, but it's nice to know how you stack up to your average or if you're getting below it. Certianly nice to know if maybe you're just having a bad day. I know some days I type 20 WPM below my average constantly and it's rather annoying.