[Plugin: Login With Ajax] Need custom fields for registration, turn off ajax just for register-link?

hi,

i would like to use the login-with-ajax widget with my site, but i have to use a special registration page with added fields (done with Cimy User Extra Fields)!
How or where can i disable the ajax-functionality just for the registration-link so the url http://www.mydomain.com/wp-signup.php is used and all my custom fields can be filled on registration instead of just username & password?

greets

http://wordpress.org/extend/plugins/login-with-ajax/