It would be nice if there was a way to ‘link’ entries that are in 2 categories.
For example, I have my google account listed both under logins and email. If I update the password in one, I might forget to do the other.
This is already possible for 1Password membership vaults, though the 1Password for iOS app does not yet have the capability of establishing these links. At the moment you'd need to use one of the desktop apps (e.g. 1Password for Mac) to do so. Hopefully we can expand that in the future.