This is a question about a feature not available in the cms. I have site that implements Wordpress, Drupal and now IP. WP and Dru have this field available, and I'm wondering if I can get this here or be guided to the file(s) I need to edit or add to make this feature available to me (and possibly others).

The field should have these attributes:

• A text field that is visible on during registration only. (I have done this with Field Type: Text Field; Allow Users to View: Yes; Viewing Settings: No to All)
  
• This text field acts as Confirmation code, but has one (or more) admin defined codes. This allows restriction of new members based on a code previously communicated. (should I clone and edit the captcha module?)
  
• Optional: If possible, storing a list of selected words in the database (along with word expiry dates) would make this feature perfect.
  

Hi Erix, unfortunately such a feature is not currently available.

If you have PHP skills, you may try to code it by using CAPTCHA code, or you can create a new plugin to implement this... I can guide you if you wish.