Add a password field to the ProSites signup form

I am running prosites on my network where users sign up for a user account and a blog at the same time. One thing I dislike about the signup process is that the user can't pick their own password, instead it is emailed out to them, they also don't get a chance to input their personal info like their name.

Is it possible to add a password field and name field to the sign up form - preferably with the username and email address fields.
Thanks