Can one do a highly controlled rollout of the purchase order autocreate functionality? How?

The attributes of the CREATPO workflow work together to drive whether or not purchasing documents are autocreated and auto approved from approved requisitions. 

In our current scenario in PROD the buyer manually creates purchase orders based on approved iProcurement requisitions.   No futher approval of the PO document is required.

Since the buyer manually intervenes to create the purchasing document (im many cases a release against an existing Blanket Purchase Agreement for the item concerned), there is an ability/opportunity to "fix" any issues on the originating requisition.  Such issues arise as we have 400+ retail stores whose staff create requisitions and these staff are temporary workers whose turnover is high and hence the quality of the requisitions is not always what one would want.