I have found a sort of workaround if your staff use timesheets.

In the reports section  you can generate a report for each person based on their timesheets submitted/paid.  Unfortunately for me it only goes back to the last 9 weeks - irrespective of what dates I ask it to give me - but as our staff are paid leave on their previous 12 weeks' average, I can manually add the difference.  You can export this to excel and then calculate the average daily pay.

So typical of QB not to have sorted this out yet.  They really do not comprehend how people pay their staff.