Forum OpenACS Q&A: Response to Adding additional HTML into forms
Some combination of form elements "-extend"ed into the form, custom widgets and specialized templates should do the trick.
Dave, looks like I can't paste a screenshot right here in this thread, but if you go to the "Testing Group" where you had a look at my questionnaire module, you can see the admin UIs for both it and the Poll module.
Here's the url: http://www.epimetrics.com/groups/Testing%20Group/. If anyone else is interested, email me and I'll add you to that particular group (it's not a public one and I'm running it in "closed" mode) or else put up some screenshots.