Any Help on Adding Edit to Older Items

I have been unable to update my own items just trying to edit them.  Is there any option for creator to allow old items to be edited by the buyers. Since the person who made the item is allowing the edit does it not make sense to have an option in the “Edit Details” to change weather or not the item can be edited by buyer. I used to be able to edit my own items and repost them but that is no longer an option unless the allow edit button has been checked. Why can’t we do simple edits, like moving the image to a center position without having to make an entirely new product. I have been able to do this with things over the years, even items that have sold, It seems like the control we had over out products has been stripped away  I just found an igloo cooler ( you know how old those are) that needs the images moved to make it centered. Nothing drastic but now I can not even get the layers and move them but have to make the entire thing over. I know I can transfer the design but that is a lot of unneeded work when it is my own item. I do not understand why a simple adjustment in the ‘additional information’ can not be added to allow item to be edited. If you check it the buyer can edit whatever they want just as you can.   Just an additional fix that many will appreciate. 
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