I was able to do what I needed here for the auth text. I did it by editing ProfileSelect.template and replacing the (var i = 0; i < authListSet.length; i++) {
logic with

document.writeln('<tr>');
document.writeln('<td width=40%>');
document.writeln('<FONT size="-1" face="PrimaSans BT, Verdana, sans-serif">');
document.writeln('<li>');
document.writeln('Username');
document.writeln('</FONT>');
document.writeln('</td>');
document.writeln('<td>');
document.writeln('<input type=text name="uid">');
document.writeln('</td>');
document.writeln('</tr>');
document.writeln('<tr>');
document.writeln('<td width=40%>');
document.writeln('<FONT size="-1" face="PrimaSans BT, Verdana, sans-serif">');
document.writeln('<li>');
document.writeln('Pin and Token');
document.writeln('</FONT>');
document.writeln('</td>');
document.writeln('<td>');
document.writeln('<input type=password name="pwd">');
document.writeln('</td>');
document.writeln('</tr>');
document.writeln('</table>');

Changing say "Requestor Email" to different text is more difficult to figure out though because for (var n = 0; n < inputListSet.length; n++) { logic is more complex.

Viewing the source of the HTML shows things like
inputList.inputId="requestor_email";
inputList.inputName="Requestor Email";

are declared at the top as variables. I can't figure out where those names are set but allowing you to override them in a config file would be great.

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