If I get it correct there is a major troll in the Delta board and the solution would be to apply verification to all of FT? I think it's better to solve this problem at the source, the troll in this case. If very active moderation is performed by locking each account the troll uses he/she will eventually give up. It's also possible to restrict access to the DL board to certain posters who could "apply" for access after proving their identity.