Can you alter the default Report Category of Payroll Report

I would like to build a Custom Flow Pattern containing multiple seeded payroll reports as tasks within it. I would like for all those reports to come out in Excel, as most generate a PDF instead by default. The concern is, the Report Category parameter when submitting the flow pattern, the parameter values are specific to the report such as: "Retroactive Notification Report in Excel", "Retroactive Entries Report in Excel", "Payroll Activity Report in Excel". Thus, when I enter my parameters, I can only select one value, which will make all my reports within the flow pattern still in PDF.