Want to render a taxonomy select like a CCK textfield rendered as checkboxes

Hi, please have a look at the attached screenshot.
The first field is a vocabulary rendered using TSS.
The second field is a simple CCK textfield rendered using the checkboxes widget.

I would like that the first field looks exactly like the second one, that is, no fieldset/legend and checkbox items rendered as a column.

Is this possible using TSS as is?
If not, consider this as a feature request.