shared mailbox has a full feature integrated on zimbra

Currently there is a zimlet that allow certain stuff done
https://github.com/Zimbra-Community/shared-mailbox-toolkit

but it will be good to have integration like the exchange, for example
on te administración panel for the user account or user mailbox have a list of the shared mailbox, and be able to remove or add another from there, also be able to give the permission to send as from there, in a company is common that several people have access to the same department mailbox

the tag created for a mailbox also get shared to all accounts

the mails send from the shared mailbox shut be on the send folder of the shared mailbox