Email Verification at Registration

Hi,
I think TML is a great plugin, but it’s lacking – or better said, i can’t find it yet – the possibility to force the new user upon registration to check his e-mail and click an activation link (email verification).
Is it there, and did i just didn’t see it (someone in the forum wants to “turn it off”, so it must be “turned on” than as well?!), or isn’t it possible.
Your help is most appreciated,
Martin