Got authentication to work, as a core.User class!!! Hell yeah!!!
Steps:

1)
put 
grails.validateable.classes =
[com.grailsrocks.authentication.SignupForm, com.grailsrocks.authentication.LoginForm]
authenticationUserClass = core.User
Into conf/Config.groovy

2)
Use format from AuthenticationUser views gsp


Apparently signup is working fine, but login isn't.
Also, can't have fields NOT be nullable if I want to include extras.
When I insert "mufasa" or w/e for my favoriteDancer, it just auto saves
as blank...

Must fix all these.