ASCP - Planning Time Fence - Desire to anchor to START DATE, not DUE DATE

Our user community would like to implement a way to reduce the nervousness in one of our inventory organizations. This inventory org is a feeder org that will build supply for other orgs, however they are experiencing nervouseness in the reschedule messages and woudl like to have a period of time that they can focus on the jobs in work without too much outside impact. We have experimented with Planning Time Fences, and Demand Time fences on particular items within that inventory org. Planning Time fence appears to be the better choice, however there is a request