Technically you could in fact schedule app execution by 3rd party programs but once you factor in admin tools for kick/ban, stats programs, and the occasional reboot etc, it becomes more complicated and less practical to do. The server in general will require pretty constant over watch in order to work well. Servman has helped in this regard immensely by allowing mission rotation, in game messages, and kick/banning from within the server.
At the end of the day much of what we do is still manually done by remote control of the server.
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