Table headings and column/row sizes

I have mapped my FM table format to a table style defined in my CSS. However, I have the following issues with the resulting RoboHelp tables:

• I have a header row in the FrameMaker table, but the header doesn't come over into RH. All of the table rows are <td> instead of <th>. Therefore, the shading defined in my CSS for the table header row does not appear.
• A bunch of inline formatting that I don't want is coming over, defining the table width and the row width and height. Here's an example:

<table class="formatA" cellspacing="0" width="600">

    <tr style="height: 18.00pt;">

        <td style="vertical-align: top; padding-left: 6.00pt; padding-top: 3.00pt;

             padding-right: 6.00pt; padding-bottom: 3.00pt;" width="198"><p>Report/Visualization</p></td>

        <td style="vertical-align: top; padding-left: 6.00pt; padding-top: 3.00pt;

             padding-right: 6.00pt; padding-bottom: 3.00pt;" width="402"><p>Description</p></td>

    </tr>

Is there any way to get RH to recognize table header rows?

Also, is there any way to prevent the size information from coming over? What I'd like is for the table width to be 100% and the cell widths and heights to be determined by their content (which would happen automatically if the inline formatting weren't added).

If there isn't a way to accomplish this, then I'd probably be better off not trying to map the table styles and just going with "Source". The sizes would still be fixed, but at least the shading would appear.