No, it is not really possible. You can of course have a system based FTP account, e.g. for your Linux user that is allowed to escalate privileges to root, but the problem with this is that directories and files need specific owners that must match the subscription users. If you use another FTP account, even if it can access the files and directories, modified files will be owned by that account and no longer by the subscriber. This can break websites or at least the subscriber's access to these files and directories.
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