Unfortunately there is no way to change that restriction to allow faster reporting (only). The restriction is in place to prevent denial of service attacks...
Nope it's posting flood prevention as in spammers. Remember bathtub girl and all the porn spam we had to clean up? It was a fracking mess. This delay makes members and spammers alike have to wait a bit between posts.
So would you rather have to be patient or come in one day to some nasty porn threads posted in every section here and the search bots seeing that?
Unfortunately the programmers at VBS put the code together in such a fashion that its useage is global. It applies to the text editor no matter what you are posting. Be it a spam report or making a new thread or replying to one.
DoS is aimed at making requests to "see" pages at a rate from many drone computers that the server gets overloaded and crashes. However an on the ball host will have a hardware system in place to reconize an attack and start shutting off IP's. If push comes to shove the system will take the target server off line until the attack subsides or the system is brought back on line by the host. That's worst case though.
DDoS is aimed directly at a forum, webpage, and so on. It loads up the site so badly it goes from warp drive to thrusters only. If the database connections are maxed out it can go a couple of different ways. One would be to service the requests it currently has and make the others wait or simply become unstable and crash. If it's the latter, hopefully you have a recent backup.
The 30 second pause is just to keep spammers from flooding the forum with mindless dribble. Works for trolls also...