Unfortunately I do not see where I can limit the captcha attempts. I have gone ahead and added a couple more question/responses to the registration process. It's a pain that I need to make it more of a hassle for people to register, but today has been a very busy bot day. With any luck, the couple of extra questions will at least stem the tide.
It looks like we have pretty much gotten rid of most of the spam that was added today, if Doan or I missed anything, let us know and we'll get it in the trash with the rest of the garbage.