You can add the colopicker feature yourself. Check this link: http://www.jquery4u.com/tag/jquery-color-picker/#.T_c1OXB8nfY

Okay, so where in phpRunner do I load the jquery files, setup the css, code the javascript and how do I link it to the desired field, as in the following code?
<link rel="stylesheet" href="ui.colorpicker.css"/>

<style type="text/css">

body { font-family: verdana, arial, sans-serif; color: white; background-color: black; font-size: 0.8em; }

bg fieldset { border-width: 1px; width: 460px; }

bg .fields { padding: 25px; margin-bottom: 20px; }

bg div { clear: both; }

bg label { float: left; width: 85px; }

bg input { float: left; width: 190px; }

.ui-colorpicker input { float: none; width: auto; height: auto; }

bg .submit { margin-top: 40px; text-align: center; }

</style>
<script language="JavaScript" src="jq.js"></script>

<script language="JavaScript" src="jq.color.js"></script>

<script language="JavaScript">
$(document).ready(function() {
var hideit = function(e, ui) { $(this).val('#'+ui.hex); $('.ui-colorpicker').css('display', 'none'); };

$('#bg #colorpicker').colorpicker({ hide: hideit, submit: hideit });
$('#dochange').click(function() {
$('body').css('background-color', $('#colorpicker').val());
return false;

});
});
</script>

Check this article: http://xlinesoft.com/phprunner/docs/how_to_add_external_files.htm