HUSTLE is limited to 3 fields?

Trying Hustle with MailChimp. On my first site it was awesome since all I wanted was an email capture.

But now I'm trying to use the fields in my list and can't? I'm wanting to create a proper signup form using things like Address, city, zip code and such. I also want a free-text comment field.

Am I expecting too much? Maybe Hustle isn't the right tool to do this?