Not sure what you mean, but you can edit the mod to change the drivers. The Patch folder has the performance file, this lists teams and drivers and the relative performance values. However, changing the order of this file means that you have to also change the helmets config, otherwise the driver would be wearing the wrong helmet, or even driving the wrong car. Look at the mod structure, read the files and you will see how it works.
Back-up before you make any changes so you can always revert to the original.
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www.mediafire.com] Some say you should click it, you know you want to.
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www.gp4central.com] <----GP4 Central