If we're going to have submissions highlighted based on their submitter, I have another request: Please unhighlight (make grey, or something) submissions from accounts which are less than 1 hour old, at least until someone votes them up. The first thing I do when I see a spammy-sounding submission is check to see how old the submitting account is, and if it's less than an hour old the submissions is almost always spam.

Perhaps it would be good to put a karma threshold, or at least a time limit, on the ability to submit stories. (A karma threshold might be bad for people who like to browse but not comment.)