Ability to customize the form
It would be better to have control on the form design.
Example: If you have a Yes or No options floating vertically taking more space. User feels big form even though there are only 10 questions.
There is a more space between questions.
You can give a spot to put CSS as a setting.
At least the ability to place 2 questions side by side.
Mary Kendig commented
This should be combined with suggestion: More flexibility of layout needed