I attempted this and I am not sure it is a good idea. It would appear it create a parsing issue when submissions are submitted to the database. Meaning none of the form data is saved. In version 2.0 I found I could add white space by adding a Label item and then placing this code in the form template.
<tr><td >[PENCIL]<div style="visibility: hidden;">[LABEL]</div></td></tr>
This works and I don't receiving any parsing errors writing the data to the database on submission.