Customize Feedback

I really like the new Feedback feature. Besides base documentation is there any guidance from developers or community on how to customize the feedback form besides a single rating and data entry text box. I was thinking for more like a small survey of 5 or so questions.

Maybe link a web form in the text content?

Hm, that is not what I was thinking. So this doctype is not meant to be altered with custom fields? I was wanting to keep the data from the survey/feedback in the same db as the products to easily query for reports and such.