The whole idea of "Karma" is silly. It encourages conforming to majority views and rewards people who are talkative rather than insightful - often mutually exclusive groups, since insight is gained by thinking & doing rather than posting comments. I think HN would do well to drop karma scores altogether, making this script a non-issue to begin with.
While we're on the topic of suggestions that aren't likely to be implemented ;) I like to see the user name hidden on comments and submissions until after you vote and/or reply. Judge the content on the content alone, not on the author.
To be perfectly honest I never even notice the names on comments.
OK, not totally true, I notice pg and one or two other people that I know personally. I remember when hacker news started and pg would automatically get pretty much every member upvoting him (hence him not being in the leaders section- no one even comes close I assume).