More thoughts: I think the unreliable clients should be banned not only because it messes with your stats, but more importantly, prevents people from completing downloads. There was someone the other day who couldn't complete when using the newer mainline. The client actually falsely reported that the dl was complete but 1 piece failed the hash check. He or she switched to a better client and completed fine:
http://www.thetradersden.org/forums/...ad.php?t=41676