Just cleared 17 more spam pages this morning and last night that need to be deleted. Just a heads up.
EDIT: Don't know if this is a viable option, but seeing the currently limited number of people who actually edit the Wiki, perhaps
this extension is a viable option?
As for new signups, I'd try and find a way to check them against their username here so that we don't have any question as to whether or not they are a bot.