Virtual Mail users already availabel, but we rocomend use it for testers only. Next version should have it by default. Also our demo servers use virtual mail users and you can check it.
About shell, if you set shell user limit to zero, site-admin unable use shell or create users with shell access.
About cron, it is problem at the moment, we'll looking way to disable it.
In any case you can disable cron daemon and even if users create jobs its never run.
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ISPsystem support team
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