The option you want will cause this xml to be added to the node in question.
<
assist>
<
speak disable="1"/>
</
assist>
You could write a style sheet to be applied to the xml template that woudl add these nodes to the xml or if you could find something to identify your fields you could use a text editor and do a global change to add this code. Note that you will need to save the form in an xdp format (this is the native XML format for the template).
Paul