captcha support

Yes, this is a good feature to have. However, it requires a modification to captcha module to support.

If someone finds a way to do it feedback, and creates a working patch, I will commit it.

The DRUPAL-5--3 branch of the Captcha module (3.x) supports the integration of Captcha on any form. All you have to do is use the "Add captcha adminstration links to forms" option, and then add captcha to the feedback form.