Here’s the short answer. The ‘old’ way the JDAMS were programmed was incorrect. The PP was what the coords were loaded to. In reality, that’s not how it works as coords are loaded to the bomb. You now need to step through the stations and load to the bomb itself. It’s different, but it’s correct now.
As far as QTY release, you can either ripple all 4 on 1 target, ripple 4 on 4 separate targets, or a mix of the two. The QTY option just allows you to do so with one pickle press instead of 4.