What you could do is use the multiple member's hack and then when you ban one, any similar bots to that ip will get banned. Also combining hacks works wonders for my forums. I must run at least 5 spam bot hacks. You still get bots, but like 1-5 a month.
As for what exactly you want, I haven't seen anything and either its custom or not posted on vb.org (or at least, I have never seen it before)
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