Payroll: Automatic allocation of jobs for superannuation

We use multiple jobs in payroll.  To get around having to manually work out the hours in the wage catagory I use the timesheets to enter the hours against each job.  this works fine.  I still have to manually work out the super for each job though and is time consuming and annoying in that I use a computerised system to take all the manual work out of payroll. 

My idea is that instead of ticking beside each job line when you arrow down for select job you would put the number of hours and MYOB would work out the total based on the hoursly wage in the card file.  It would be even better if the super automatically divided the amount according to the hours in the wages.  I can understand that this would only work if there was only one wage catagory selected but having to manually work out 1 pay sometimes against 23 every fortnight with some people doing 4 or 5 different jobs would save so much time