I'd like to be able to create folders within an archive just like in an ordinary folder, pressing F7.
This is my prefered way of working when adding files to an already existing folder/archive.
I know it is possible to do this by providing the path on the copy target (including a trayling backslash but excluding any name parts), but this way to do it is second choice to me.
Some archive types do not support adding empty directories. For these you might defer physically adding it to the archive until after a file is copied to that folder, or just disable adding a directory this way, just as it is now.