It would be great to easily share contacts from sub-account to another. We have 3 different businesses but our contact list overlaps since the business is somehow related. We use one sub-account as our main directory for email marketing so we need to make sure that whatever contact comes in to one sub-account will be carried over to one another. Right now the only option for us to automate is the "Copy to Contact" workflow but it would be much easier to just share the contacts in one click.