Is there any way to add a Home Button to a quiz slide?

There is a feature called 'remediation' that allows  you to navigate to a content slide. That content slides needs a 'Next button', but with the action 'Return to Quiz'. When that content slide is reached from a normal slide, the Next button will act as a Next button. When it is reached from a Question slide, the Next button will return to that question slide.

Is it not that what you want?

If not: the only interactive object that can be used on a question slide is a shape button. You can read about it in one of my blog posts:

Buttons on Question/Score Slides in Captivate 6? - Captivate blog