Can latest version be set to use the email address as the login / username? I tried and got this error Username contains invalid characters - please use digits and letters
I know this is a very old thread, but I have the same question. I am running 3.2.3 and am about to upgrade to v4. I'd really like to know if we can set it up so a user's login is their email address.
You can just remove login element form signup form (you can do it in admin interface). User able to sign in with his email address and password by default.