Thanx for a great addition to WP. I use Simple CRM in combination with John Acker's eCampaign. eCampaign has an option to generate a new user based on the data submitted. The campaign generates the user including the custom data and Simple CRM makes it accessible.
My suggestion is: could you add "checkbox" as an alternative to "text area" or "text field". I have several yes/no options that a user sets on subscribing, that I need to store, view and have an user alter.