While most servers do have e-mail set up, in some cases there is no mailer set up or you are not allowed to use it. There should be an option to remove the dependency on e-mail to send users their passwords. If e-mail is disabled, WWWThreads should just present the user with their password after they signup. Disabling e-mail will, of course, also hide the "E-mail all replies to my real email address" checkbox.
Also, another feature that would be nice is the ability for the user to change their username. That way, people can keep the same account even if they decide to change their nickname. This also allows people to fix any spelling/case errors in their nicks. I'm not sure if this is possible, but it's worth a shot.
Other than that WWWThreads is the *best* forum software ever. So good I went to the trouble of installing mySQL and Sendmail on my home Linux machine just to play with it. Great work Scream!
-Zoot