Not really. Adding support for a particular kind of metadata is a change so minuscule it doesn't qualify as a change in the format. Apple just stores their filesystem metadata as in a special sub-directory in ZIP files. And the only problem with the Apple's solution is nobody else respects it. 7zip is a format developed and maintained by a specific author who is alive and active so he can just build the same in the standard 7zip implementations and chances are everybody will accept.

By the way I have just found an actual imperfection in 7zip: it can't let you choose the order in which archived files are stored in it nor chose different compression parameters for specific files. This limits its applicability. E.g. the EPUB standard says the first file in an archive must be "mimetype" and it must be not compressed. But I believe this can be fixed with reasonable ease (and probably without breaking changes) as well.