Creating a global FTP(S) account
It might be usefull to create one or more Global FTP(S) accounts which can access all the vhost directories. In addition an IP Whitelisting filter might be desirable to additionally protect access.
It might be impossible or dangerous technically. Home folder of each account has privileges configured in a way to prevent others from accessing them. We understand extra convenience of a global account, but wouldn't like to undermine security.
But let us know if we are missing something...