Bdry,
Setting up custom forms is documented here. You can drag and drop the pre-existing field prefabs onto your feedback form prefab under the "Form" GameObject to add them to the form and resulting report. Be sure to set the Section Title for your new fields so they are properly labeled on your report.
We should put together a tutorial video on this subject. I'll add that to my notes to follow up on at some point.
Please let me know if you have any more questions!