There have been a lot of threads with suggestions about how to deal with "new" posters that just show up to troll right where their previous banned accounts left off. Previous suggestions have been dismissed as technically impractical, such as hiding them or IP bans, so I have a different suggestion.
Why not have a probationary period for new users that hits them with double or triple point infractions for trolling or flaming? It might slow them down a little to get swiftly hit with 15 points and a ban before they can do too much annoyance.
Ban evasion is a real problem on these forums and I feel like the moderation just needs to try out ideas until something sticks. Why not Zoidberg this?
Also, 30 seconds between reports is too long a wait to keep up with the level of trolling some users are capable of, if there's a way to lower that limit.