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Possible solution:

Make an override of AdminOrdersController.php located in controllers/admin. Find the line where this starts: "date_add"

add the following below that section:

            'date_upd' => array(
                'title' => $this->l('Most recent status'),
                'align' => 'text-right',
                'type' => 'datetime',
                'filter_key' => 'a!date_upd'
            ),	

This seems to be working but I'm not sure if this is entirely the correct way to do it.

Possible solution:

Make an override on AdminOrdersController.php located in controllers/admin. Find the line where this starts: "date_add"

add the following below that section:

            'date_upd' => array(
                'title' => $this->l('Most recent status'),
                'align' => 'text-right',
                'type' => 'datetime',
                'filter_key' => 'a!date_upd'
            ),	

This seems to be working but I'm not sure if this is entirely the correct way to do it.