In our web based AUT, we have reports which is formed by table. Reports will have only editable cells or non-editable cells. Silktest is able to identify non-editable cells and it is not identifying editable cells. I've compared the HTML source code and the changes are given below. The difference is a TD attribute and CSS classes.
<font class="small">Code:</font><hr /><pre>
Non Editable Cell
<td align="right" id="D_5_3" class="dcBnd" >275</td>
Have you tried other borderless table settings for the editbale cells at all?
Once you find out what setting is required for the editable cells you can handle the settings programatically in your code. Search borderless tables to get lots of help available...