Parallel datapackage processing possible for file datasource in NW2004s

Hi,
We have a huge flatfile which is quite slow in loading due to the fact that it processes all datapackages serially (25.000 records each). Is it possible at all to do this in parallel like it is possible for R/3 datasources via the control parameters option (table roidocprms- ? According to the help, the customizing RSCUSTV6 is the one to be used for flatfiles but this doens't include the number of parallel processes.
If not, would it be better for the performance to use bigger package seizes for flatfiles ?
thanks

Just to clarify :
In this case we load via the old methods (infosources/update rules) so no usage of transformations and DTP's.

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