You stated that your issue with using JQuery is an author cannot add questions. However - you can use a multifield dialog that lets an author enter questions into the dialog and the corresponding answer. Use JS logic to read the dialog and set the quiz using the plug-in. This way - you use JQuery and use a dialog to let an author set the questions. Using Adaptive form is not the best way to proceed with this requirement. A custom component using a plug-in and a good dialog is the way to proceed.
UPDATE: As of Jan 22, 2016 - we now have a community article that addresses this use case. See: Developing a custom Adobe Experience Manager Quiz Component.
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