I had been meaning to develop this one on my own, and did so last night. I combined the ideas of a unique hash with an ACP option to change the name of "agreed" which - from reading the description - is what the "ConfusaBot
" MOD does. So my MOD allows me to change the name of the "agreed" variable, and also allows me to specify the length of the hash (from 2 to 32). I didn't look at the code for ConfusaBOT so I don't know exactly how it works; I did briefly look at the code for this MOD but rewrote it to suit my needs rather than basing my MOD off of this.
I got this written and implemented on one of my sites last night.
This morning when I checked, there was already a new spam registration on the site.
So the bottom line is that while this is a great idea for making your site unique, and therefore less suceptable to "reg bots", there is still the problem of human spammers registering.
I don't know how to make that harder without discouraging the humans that we want to join.
I don't mean to hijack this topic into a general anti-spam strategy topic
but thought I would share my experience with the results so far. For whatever reason, this particular board that I run is a spam magnet, and therefore is a good test case for this sort of thing.