Yeah, unfortunately it doesn’t seem like 1Password is quite ready for enterprise usage yet due to the lack of sharing options. I personally don’t know of any password sharing product that I think is particularly great. Wiki pages, keepass vaults, etc all get the job done provided the implementation being used to share them is secure.
More important than the product itself is ensuring that people with access to the shared passwords can’t use them to access any resources after their employment ends. It’s more of an identity management problem than a product/technology failure in my opinion.