Putting radio buttons in a fieldset with data-role="controlgroup", jquery-mobile renders them like an inset list, but the legend is simply text. I would like the legend to look like the list dividers of a list view.
So instead of this:

I would like something like that:

You could put the radiogroup inside of a listview, and use the listdivider style for the title. To get to a result which is similar to what you demonstrated, you need to remove some padding, margins and borders.
See this example: http://jsfiddle.net/zdMhF/
The code: