Enabling Expense Accruals

Summary

Questions about enabling Expense Accruals after Go-Live

Content

We are in the second quarter after go-live of Fusion and the client wants to enable Expense Accruals. I have a few questions about the process:

1. Apart from the "Accrue Expense Items" field in "Common Options for Payables and Procurement", is there any other set up necessary?
2. As we don't have inventory items, will it be better to set accrual to "Period End" instead of "At Receipt"?
3. How will POs already created and receipted be affected? 
4. Is it advisable to set matching to 3 way to ensure all POs are receipted?
5. Will the Period End Accrual reversal happen automatically or will a program have to be scheduled?