McSpike -
No browser/surfer would be blocked, because they have no need to go into the submit area, and the possibility of blocking a good webmaster when taking out a bad one is sooo small that it is worth the hassle of getting rid of the bad one. Maybe a cookie based option would work, where the next time they come to the site and you have set them for no submit it just takes their info, but never shows it to you as an option. That way they have no idea that they are blocked, they just get pissed cause they never get listed anymore
Tim