Sure, you can add clones of the navigation buttons with JavaScript.
Add the following to the end of template.js. It will insert a new div after the progress bar and then insert clones of the nav buttons in the new div.
$(document).ready(function() {
// Insert a new div after the progress bar
$('<div id="navigator2" />').insertAfter('#progress-wrapper');
// Style the new div
$('#navigator2').css({
'text-align':'center'
});
// Insert clones of the nav buttons in the new div
$('input.submit:eq(0)').clone().appendTo('#navigator2');
$('input.submit:eq(2)').clone().appendTo('#navigator2');
});
This example is for the default template in 1.90 or 1.91. The placement of the new div may need to be modified for other templates.