Dynamic Account Derivation on payroll journal

The accounting code associated with each of our pay elements can be from one of 2 ranges, depending on whether the employee is Direct labour or Indirect Labour. This is determined by the department - so for example the Operations department is a Direct cost department and employees' gross pay is posted to account 5000 whereas Finance is an indirect department and gross pay is posted to account 7000. We can't get the payroll journal to distinguish between the 2 categories so we can't currently automate the payroll journal, we have to manually manipulate the data. It would be good if more than one account code could be available for each pay element and which is selected is determined by the employee's department. The benefit would be that we don't have to manipulate the data before loading it into our accounts system. This would save time and reduce the incidence of error