jQuery Mobile Tab Widget Styling

jQuery Mobile Tab Widget Styling

Is it possible to modify the default styling of the jQuery Mobile Tab widget to be more like the jQuery UI Tab widget? More specifically, I'm looking to add a small gap between the tabs and to round out the edges (changing the jQuery Mobile 'Corner Radii' setting through the ThemeRoller had no effect).
 
If this is not something supported out of the box through the current API, does anyone have any insight into how I would go about manually overriding the style?
 
Thanks