[Coroner]

There is NO option for a sortorder inside a category.

you can try this:
in umg_global.php search for:

			if ($vbulletin->GPC['sort'] == 'name' OR $vbulletin->GPC['sort'] == 'date')
			{
				if ($vbulletin->GPC['sort'] == 'name') $sort_by = ' ORDER BY media.title ' . $vbulletin->GPC['sortwho'] . ' ';
				if ($vbulletin->GPC['sort'] == 'date') $sort_by = ' ORDER BY media.dateline ' . $vbulletin->GPC['sortwho'] . ' ';
			}

and change it into

			if ($vbulletin->GPC['sort'] == 'name' OR $vbulletin->GPC['sort'] == 'date')
			{
				if ($vbulletin->GPC['sort'] == 'name') $sort_by = ' ORDER BY media.title ' . $vbulletin->GPC['sortwho'] . ' ';
				if ($vbulletin->GPC['sort'] == 'date') $sort_by = ' ORDER BY media.dateline ' . $vbulletin->GPC['sortwho'] . ' ';
			}
			else
			{
				$sort_by = ' ORDER BY media.dateline ASC';
			}

were ASC stands for oldest - change into DESC for newest