Haven't had a single new spammer registration since installing NoSpam!
I managed to find the pieces for doing this in 3.5.4 by scouring the whole thread. But to save some of the rest of you some trouble:
INSTALLING IN VERSION 3.5.x
- Download from here:
https://vborg.vbsupport.ru/showpost....6&postcount=36
- Modify 'register' template per this post:
https://vborg.vbsupport.ru/showpost....6&postcount=40
Don't forget to actually turn it on in the options (accessed via your vb options) in addition to enabling the plugin.