Featurerequest: Auto-wakeup of machines or command-line support

It would be nice if there was something like an auto-wakeup of machines when gwakeonlan is started. That way it would be possible to get machines woken up automatically when the user logs into the desktop.
Or supply a commandline-param that allows to start a defined host, then one could use the autostart-features of the desktop-manager for this.
TIA!