Thanks for the reply Jason.
Hmmm, that's the problem. I'm not using SA wizard to build my reg pages just the behaviours and I want to apply captcha. Installing the form toolkit will conflict with SA and DA, as widely reported throughout this forum.
Is it likely that WA will enable this functionality in the next release?
What do you suggest as a workaround?
My other option is to try another product like DMXZone's captcha http://www.dmxzone.com/go?19386 I guess.