I apologize for the wait in the response,
you can remove confimation from email fields (see the screenshot of component's option page).
Ideally, you may have a form only with firstname,lastname,username,password and confirm password; the password confirmation field is mandatory, unfortunately you can not see the password when the insert (******) and so it is important to make him retype.

In the next release we might think of giving the option to remove the "confirm password" doing the password field in clear mode(not ********).

if you want to simplify the registration process you can remove the username field (set options-> type login with e-mail) and the lastname field (set options-> name style with only name).

You can try all of these configurations with the version "Free to Try".

we will consider this idea, thanks for your suggestion