Hm. What you can see on some forums is some spam protection, which ensures that there need to be at least x seconds between posts, but that can get quite annoying if you use tabs and write several replys at the same time.
But looking at that recent attack… I think it would be good to ensure that you can only start a new topic every x minutes (5 mins should be just fine). AFAICT it shouldnt affect usual posting behaviour, but it would slow down attacks like the last one (and it would also annoy crossposters quite a bit).
Well, either way… we need some more “super admins” (people who can delete posts/users).