Most wanted feature is … something like “copy item description template” - I mean when you are making description, tags, features (like photoshop / file type - PSD … etc) … all this stuff before item upload and I would like to have possibility to copy all this to next window so I can just upload another preview files and zip file and just upload this item, without making all this stuff again. ;]
for now it is impossible because when you just copy the window to new tab it is till the same item and all changes made in this new window will apply to this item.