Registration export field control

It would be nice to control what fields and their order are exported to CSV file.
Also show data of members of a group registration. I’m thinking in a Child like status?

Reg num | first name | last name | other field |
1 | mike | test. | field. |
1a. | mick. | tester. | field a

Found this my self in the configuration under the "Export Registrants settings" tab.