[lucaspiller]

I believe that extra field thing is correct. However I don't think your solution is really great either, by forcing the user to confirm their email before continuing your are interrupting their flow. In some cases when I've had this and the email has been delayed by even a few minutes I haven't bothered coming back.

Edit: Sorry I kind of misread your comment, but what I said is half relavent. None of the protections you state you get without forcing them to click the link before continuing.

[nostrademons]

Yeah, confirmation e-mails suck from a UX perspective. However, they don't gratuitously suck - they solve the problem they're trying to solve, and often users can tell why they're necessary. Extra form fields suck from a UX perspective and have the added problem of not actually solving the problem they're trying to solve.