Enable to use the "Partition" as a grouping field in People performance reports

Today, the "Partition" information cannot be used as a grouping field in the people performance reports. And yet this a key grouping field, very convenient to run counts of the database. As a consequence, we need to establish some proxy custom field containing the same information, with some smart campaigns that fill it out.

It would be much simpler if it were possible to simply use the "Partition" information as a grouping field in the People reporting

-Greg