Dear Harry,
You should use LSMW. Search on internet you can find how to create a project for mass data upload / change. It's easy and the standard method.
By the way, I don't understand why you need time status "0" for running RPTQTA00! As I know you can generate quota by RPTQTA00 if you set your quota as "No generate" in V_T559L section "Quota types" but it's not depend on time management status.
Regards,
Omid