I took the silence to mean it's not possible with predefined sets. Which seems odd to me that Aruba wouldn't expect you to want to export your Accounting data.
I managed to gather this data by using the following SQL Query
SELECT Records.nas_ip AS host_ip,
Records.user_name,
Records.remote_address AS user_ip,
Details.attr_value,
Details.timestamp
FROM tips_tacacs_accounting_details AS Details
JOIN tips_tacacs_accounting_records AS Records
ON Details.session_id = Records.id
WHERE Details.attr_name = 'cmd'
AND Records.timestamp >= --START-TIME--
AND Records.timestamp <= --END-TIME--
I would be interested in hearing if there are any other, better, ways to do this.