1) Design editing is not an included feature like in powerstore. You would need to edit designs by hand in the webassist/themes/ folder.
2) What did you use as the email FROM address? What did you configure as your smtp server in the settings page? GoDaddy has specific requirements for those fields.
3) The empty hint box sounds like it could be a bug. I don't think that box needs to be checked for GoDaddy.
4) The simple and complete forms are the only ones available. You could edit the form and add the CAPTCHA from the complete form to the simple one using the Webassist Form Toolkit extension or by copying and pasting the required code.