we used the Ginesys planning to replenish the stock were there is a custom parameter in which we had given store rank.
this store rank will get uploaded only through an excel sheet. it will be better if we get the adding option or the edit option in the interface only.
We liked you suggestion from operations point of view , however as per the current system architecture we cannot provide Custom parameters to be edited in the same line item screen. This needs to be done via Excel only. The process though it very simple like first download the file and then upload the same after changes.