I had one of them the other day that I deleted as spam from one of my RP threads. I hope that was the right way to do it so that you could help, if not just let me know what would be better, Nunu. Though it probably is more of the big bosses problem.
There's another method of banning that can be used on people who know how to circumvent ip bans, it's not the ultimate solution but it will keep those people quiet for a longer period of time. Probably not a good idea to share that info here as they may become wise to it, I'll send a pm to Nunu about it.
In all seriousness, these guys always seem to show up at the worst times. I remember one time when I was just starting out on a server as a moderator the administrator had juuuust clocked out when roughly 100 alts started flooding in like someone had hung a "Free Beer" sign and started spamming like a mad man. Pretty sure I nearly broke my mouse manually banning them all as fast as I could (had to right click and boot manually because of my permission set)... Worst game of whackamole, ever...
That said, I always buy a round for the following... Good officers, firemen, EMTs, troops, and voluntary moderators. The flack you people put up with... Make sure I buy you a round if I ever meet up with you in person!
Note: I've also been known to buy pizza or soda when alcohol isn't desired... :3