What a great mod, well done.
Not sure if anyone else has already suggested similar but .... I have a suggestion that comes from my experience of blocking spam on Wiki's. The main wiki I use is called PmWiki and it has a built-in 'blocklist'. The reason for mentioning it is because several groups have formed and maintain "shared blocklists". These blocklists are downloaded by PmWiki and used in addition to the user configurable blocklist.
I recommend spending 5 mins reading the PmWiki blocklist page http://www.pmwiki.org/wiki/PmWiki/Blocklist
as it describes using well known blocklists such as chongqed.org
In summary, I think it would be great enhancement if you could automatically (every day) download a local copy of the following blocklists:
You could then parse these in addition to you existing spam words. I feel this would greatly the reduce the amount of effort required to maintain the spam word blocks and get newbees up and running quickly.
By the way, does your mod also support blocking IP addresses and or address ranges?