You can add threads[x].threaddate and threads[x].threadtime where you want them, like maybe:
Code:
<script type="text/javascript" src="external.php?forumids=2,1635&type=js"></script>
<script language="" type="text/javascript">
<!--
for (x = 0; x < 10; x++)
{
document.writeln("<a href=\"showthread.php?t="+threads[x].threadid+"\">"+threads[x].title+"</a> (Submitted by: "+threads[x].poster+") " + threads[x].threaddate + " " + threads[x].threadtime + "<br />");
}
//-->
</script>
but the other things you asked for aren't in the javascript external feed. You would have to edit external.php to add them.