Easy customization of the shipment states to group with
I have a customization that set back to draft the shipment created by sale (because customer wants to validate them prior to ship). But the grouping module may add the move to an already waiting shipment which is then reset to draft as it is considered as the newly created shipment. So I have to customize the state of the shipment to choose for grouping but it is complicated right now because I need to "parse" the domain. Instead I think we should have a property (like the others) that define which state must be used.