Payrite Calculation Routines to EP functionality

Please could we have the facility built that currently exists within payrite to run calculation routines for clients, in payrun. This is where say payments, deductions or pensions have specific routines built to move them from imports into the payslip deductions or payments or pension. e.g one of our payrolls has payments run on a calc routine into deductions, those payments are gross ups for tax and ni purposes. Another payroll has the ni saving added to the employee contribution for their pension.